拜年 is a fundamental ritual of the
春节 (Chūnjié), or Spring Festival. Its primary function is to reinforce social and familial bonds. It's a physical manifestation of key Chinese cultural values like filial piety (孝, xiào) and respect for elders. The unspoken rule is to always visit the oldest generation first (e.g., grandparents), demonstrating a deep-seated respect for hierarchy and seniority.