An anniversary is a significant date or event that marks a milestone in time, such as the founding of an organization, the completion of a project, or a personal celebration like a wedding or birthday. The study of anniversaries involves examining the historical and cultural significance of these events, as well as how they are celebrated and commemorated over time. Researchers in this area may explore the rituals, traditions, and symbols associated with anniversaries, as well as their impact on individuals and societies. Additionally, they may investigate the social and psychological implications of commemorating anniversaries, such as the role they play in reinforcing collective memory and identity.