Answer:
Main sequence
Step-by-step explanation:
H-R diagram refers to the plot of stars- absolute magnitude vs surface temperature. There are three main parts of H-R diagram:
A region in the H-R diagram where the star spends most of its lifetime is known as main-sequence. It is a band which extends from upper left side to lower right.
After main sequence, the star either becomes red-giant or super-red giant. Stars enter this region when they have used up all the fuel.
White dwarf stars are formed at the end for a low to intermediate mass star.