A configurable, live-updating "smart list" of records that match its filters. Segments back almost every Customer Success workflow in ChurnZero — they target Plays, drive Alerts, scope Surveys, restrict ChurnScores, and filter reports. Segment Entity types include Account, Contact, Event, Message, Task/Activity, Note, Meeting, SurveyResponse, SuccessPlan, Signal, and Custom Table records. This API returns only Segments over entities it exposes (Account, Contact, Event, Task, and Custom Table lists), and only Segments the caller owns or that are global, unless the caller has Full Configuration Control permission.