Saved Segment

A saved segment is a named group definition built once so that later reports can call it without rebuilding its filters.

What gets stored is the definition, not the list of people, so membership is recomputed on every run and the segment's size drifts over time, unlike a static cohort which keeps its members. Its main value is giving a team one shared vocabulary: when everyone reads paying users from a single definition, two reports become comparable. The less visible risk is editing, because changing a saved segment quietly changes every report that references it, historical ones included, and a metric that nothing happened to appears to jump on a particular date. Treating an edit as a new segment and leaving the old one untouched avoids that.