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Given sufficient temperature and pressure, 4 hydrogen nuclei fuse to produce helium, at the same time giving off energy in the form of heat and light and other forms of radiation. This means that stars, with a few exceptions such as super-massive stars, last for many billions of years.
Stars are fusion engines, and they are powered primarily by fusing the element hydrogen into the element helium (the first and second most abundant elements in the universe, respectively). This process sometimes goes under the name proton-proton reaction.As stars exhaust their hydrogen fuel and build up a lot of helium, they begin to fuse the helium together to form the element carbon in what is called the triple-alpha process. Links are provided to the relevant Wikipedia articles. The threshold temperature of hydrogen fusion (sometimes called a proton-proton reaction) is on the order of 10,000,000 K to 14,000,000 K or 10 to 14 million degrees Kelvin.