Stars are distant Suns, but so far away they look like points of light. They are giant balls of hot gas, just like our Sun. They are also like people. They are born, live through a long middle age, and finally die. Some stars are alone, like our Sun, and others have a constant companion, usually another star.
Stars also change as they age.
Stars are born out of huge clouds of gas and dust that fill some of the space between the stars. Our Sun is now about halfway through its middle age. It will continue to give us light and heat for another 5 billion years. How long a star lasts depends on how big it is. Smaller stars live calmly for hundreds of millions of years and die much more quietly.