Answer:
Turbulence deep within giant clouds of gas in space gives rise to knots with so much mass that the gas and dust can begin to collapse under its own gravitational attraction. The material at the center begins to heat up and will one day become a star.
A star needs to form from a nebula, or a giant cloud of hydrogen gas. There are nebulae scattered throughout our galaxy and they are often called "stellar nursuries" because they give rise to stars.
Often, radiation from a nearby supernova will trigger the formation of stars within the region by causing the clouds of gas to begin to contract. The gases will collect in the center and begin to heat up from friction, forming a protostar.
For a true star to form it needs to begin the process of nuclear fusion. Eventually the protostar will get hot enough for hydrogen to begin fusing into helium, releasing large amounts of heat and light, among other forms of radiation. And so, a star is born.
This entire process is slow and usually happens over long periods spanning millions of years.