They are usually to make money, gain satisfaction and benefit society. The primary purpose or reason to start a business entity is to earn profits for its owners or stockholders. Pure and simple. For the sake of public relations, such a statement is kept private. The secondary motivation is to provide some sort of satisfaction or enjoyment for the owner.
People usually start and run businesses in areas that they are interested in and enjoy.
The third reason to run a business is to be able to help others and to do good for society. It is true that leaders of many companies don't think about helping others, but the ones that are truly fulfilled and the companies that are truly successful realize that this is also important. Some have another order There are companies that are run with these three items in a different order. This is similar to people who have a hobby they enjoy and that is their primary motivation. Getting money for them is just something extra.