The process of change that a star undergo during its life-time is called the
stellar evolution. The primary factor determining how a star evolves during
its life-time is its mass at the time when it reaches the main sequence. From
evolution point of view stars can be divided in mainly 3 types- high mass
stars (M > 8 M_sun), intermediate mass stars (8 M_sun > M > 2 M_sun ), and low
mass stars (M < 2 M_sun). In this talk I will brie
y discuss the evolution,
through various life-stages, of different mass stars.