An alumni association is an association or group of former pupils or students of a particular school, college, or university, or even former members of an organization or company. Alumni associations usually regularly organize or arrange for special gatherings, get-togethers and events for its members that can be either informal (e.g. reunions) or formal (e.g. career and job fairs).

Alumni events have many purposes, and being part of an alumni association also has many benefits; for example:

The Importance of Alumni Relations
How Does An Alumni Network Really Matter?
Successful Alumni Engagement