The hair cycle is the process of hair growth and shedding. It consists of three phases: anagen, catagen, and telogen.
Anagen is the growth phase. This phase can last for several years and is responsible for the majority of hair growth.
Catagen is the transitional phase. This phase lasts for about 2-3 weeks and signals the end of the growth phase.
Telogen is the resting phase. This phase lasts for about 3 months and is when the hair follicle sheds the hair strand.
The length of the hair cycle can vary from person to person. The average cycle is about 25-30 days. However, some people may have shorter or longer cycles.