Marxism

Marxism is the name for a set of political and economic ideas.
The basic ideas are that:
The world is split into multiple classes (groups) of people. The two main classes are the working class and the ruling class. The working class is exploited by the ruling class.
There is a class conflict
When workers realize their exploitation, they will revolt and take over ownership of factories and materials (dictatorship of the proletariat)
Communism (stateless, classless society with free enterprise).
These ideas come from the works of Karl Marx and Friedrich Engels and their most notable work is The Communist Manifesto. They have had a lot of influence in many countries. Marxism influenced other political views, such as social democracy and reformist socialism. Both believe that the ideas of Marx and Engels can be achieved through what Marx called 'bourgeois democracy'.
People disagree a lot on how a Marxist society should be organized: "Marxist political economists differ over their definitions of capitalism, socialism and communism. These differences are so fundamental, the arguments among Marxist political economists have sometimes been as intense as their oppositions to capitalism".
Marxism is placed on the left-wing to far-left of the political spectrum.
Key ideas
The working class vs. the capitalist class
Marxism says that people in the world are organized into different groups, or classes, based on what they do for work.
Most people are called "workers" because they work in factories, offices, or farms for money. They belong to the "working class" (or "proletariat"). These people do not own the places they work in or the materials they need for their work.
Another group, who are not as big as the working class, are "capitalists" (or "bourgeoisie"). They own the factories, land, and buildings that the workers work in. They also own some of the tools the workers have to use. Marx calls capitalists the "Ruling Class" because they live off of the work of all the workers. He also says that the capitalists own the government, army, and courts.
In Marxist views, capital is the "means of production" and money which the capitalist can invest in different places of business, so that they can "profit" or gain more capital.
Most workers work for companies owned by either capitalists or "petit-bourgeois" (small-time exploiters). The capitalist pays the worker in exchange for the worker's time. The capitalist has bought a period of time from the worker, which the worker must then use to labor for the capitalist. According to Marxist thinking, this is the only way that a capitalist can create extra money from a commodity (a piece of merchandise). The capitalist exploits the worker's time as much as they can. The capitalist receives a certain price for the commodity the worker made. The capitalist builds up capital by paying the worker less than that price. In this way, the capitalist exploits the worker's labor by:
Not paying the worker what their labor was worth
Keeping the extra money that they did not pay the worker
Here is an example of exploitation of labor. Jane is a shoemaker. She works for Michael, who owns a shoe factory that can make 60 pairs of shoes in a day. Jane makes 60 pairs of shoes every day. Michael pays Jane $20 a day. However, Michael sells each pair of shoes for $2 each. This means he makes $120 in a day. After he pays Jane her $20 wage, Michael has $100 left over. However he then has to pay for materials which cost $1 for each pair, so that's $60 each day. Then running expenses of the factory cost him $10 a day. So he only gets $30 at the end of the day for managing the business. This remaining wealth is called "Profit" or "Surplus [extra] Value." In other words, even though Jane makes 60 shoes every day, she only gets paid the value of 10 pairs of shoes. The rest of the day, while she is making the other 50 shoes, she is creating money for her boss. Her labor is making him richer and helping him earn money.
It is this Surplus Value, or Profit, which Marxism thinks as an exploitation of labor. This exploitation allows the smaller class (capitalists) to live without working while making a profit, while the bigger class (the workers) have to work for the capitalists to survive under usually poor working conditions.
Marxism says that factories, tools, and work places cannot create new value on their own. They are like a blueberry bush: it has no value on its own. People have to create that value by laboring. For example, someone spends a day picking blueberries. Those blueberries can now be traded or eaten because of the labor that was put in to pick them.
Class struggle
Marxist thinking claims that capitalists and workers are constantly struggling. They call this "Dialectical Materialism." This is the idea that the history of humans is the history of conflict between classes. Different classes with different interests argue or fight each other. Social change (or in its absence, social stagnation) is the result.
Marxism says that capitalists want to exploit the workers as much as possible and make their pay as low as they can. The capitalists do this to create as much profit for themselves as possible, as quickly as possible. Workers, on the other hand, have to struggle to keep their wages up and to keep the "rate of exploitation" low, so that they can live more peaceful lives. This is what Marxism calls "class struggle": where workers and their bosses fight against each other to gain for themselves.
Marxists think that all of written human history has been divided by economic classes. One example is feudal society (a medieval society controlled by feudal lords and nobles). The ruling class got their power and wealth from the labor of peasants (farmers). But as peasants demanded more and more for themselves, small shopkeepers and tradespeople began to appear. Many of these people formed guilds and eventually began to employ workers. These workers were able to gain wealth for themselves at these jobs. These historical events created capitalism.
In this way, Marxists think that history has been pushed forward by class struggle. They think that change will be born from this struggle, just like capitalism was. However, they also think that capitalism will give way to communism; as the exploitation of workers becomes worse it will lead workers to revolt against their capitalist rulers.
Materialism
The core of Marxist thinking is called Materialism. Materialism is a philosophical view that says that communities develop from the "ground up". It says that the "higher" qualities of culture (like art, manners, customs, and religions) are actually founded on the "lower" or simpler qualities of life. These qualities include having enough of what people need to survive, like food and shelter; who has money and what they have to do to get it; who is allowed to work, and who is forced to work.
Changes in the higher qualities of culture (sometimes called the "Superstructure") are often linked to changes in the lower qualities of life (sometimes called the "Base"). One example is that in medieval times, people thought "honor" or duty to people with more power than them was very important. Today, in Western countries, many people see ambition (being someone who works hard for their own goals) as more important. This is because, in medieval times, people worked their entire lives under lords who depended on them not only for work but for war. Today, people work for themselves more, and our society lets some people move up from being poor to being rich. In this case, what people see as good and important depends on how the rulers get value out of their workers.
A "classless society"
Marxism recognizes that in earlier time periods, we lived first under rulers who owned everything. Then we lived under lords who owned land with workers who lived and worked on that land. In Marx's time, people lived under governments that allowed many people to own property. Eventually, Marxists believe that we will move to a society where everyone owns everything in common. This will be called communism.
In other words, human society has always been based on the economic forces that human beings can control. For Marxism, this means that each society would take its form based on its "mode of production."
Marxists believe that humans' ability to produce goods and services today means people can move beyond the conflicts of a society that is divided into classes. Many Marxists believe that there will always be revolts and, with the right conditions, revolutions. In these revolutions, the workers will fight the capitalists. If they win, they will set up a socialist "workers' state" (a form of government where the workers are the rulers of society). This workers' state will only be temporary. Its job will be to take power away from the capitalists, until all the capitalist countries in the world are defeated, and social classes no longer exist.
Marxists believe that if the working class makes itself the ruling class, and destroys the basis for class society (private property, or what Marx called "Bourgeois Property"), there will be a "classless society." In a Marxist society, no social classes are in conflict, and there is no government anymore. The state will no longer be needed. There would be no countries. The world will have no borders. There will be communes around the world. Workers will organize production of goods and services based on what people need, not based on profits.
Beliefs about modern communism
Some Marxists say that modern "communism" is not communism at all. They say that "communist" countries like the Soviet Union, the People's Republic of China, Cuba, and Vietnam are really using different forms of capitalism, often with heavily "nationalized" industries. A thinker named Tony Cliff was one of the biggest supporters of these ideas. He wrote that states like the Soviet Union and Communist China (before 1980) were "State-Capitalist."
Not all communists, socialists, or Marxists agree on this question. However, many strong supporters of Marxism agree that:
With socialism, workers have democratic control over economic decisions and social justice
An economy produces things (makes goods and services) based on what people need
Socialism will die and change into communism when capitalism is defeated
Distinction between Marxism, communism and socialism
People use these terms interchangeably but this is incorrect. These concepts have different meanings:
Marxism is a method of socioeconomic analysis that uses a materialist interpretation of historical development, better known as historical materialism.
Socialism is a way of organizing a society in which the means of production are owned and controlled by the working class, instead of the capitalists.
Communism is the theoretical classless, stateless society that Marx proposed would arise after the demise of capitalism.