Hair length refers to the measurement of hair from the scalp to the tip of the strands. It can vary widely among individuals and is often categorized as short, medium, or long. Short hair typically reaches above the shoulders, medium hair falls between the shoulders and mid-back, while long hair extends beyond the mid-back. Factors influencing hair length include genetics, age, and health. Hair growth occurs in cycles, with each strand growing approximately half an inch per month on average. Regular haircuts can help maintain a desired length and promote healthy hair growth by removing split ends.