PubNub's presence feature enables real-time tracking of user or device connectivity status on channels, allowing for the detection of when clients join or leave, whether they are online or offline, and the occupancy of a channel. It offers flexibility for various use cases, including monitoring chat participation and IoT device connectivity. Users can customize presence metadata to reflect statuses like 'away' or 'do not disturb.' Enabling presence may increase transactions, and the system includes management tools to control event frequency. Events like join, leave, and timeout are generated based on client actions, with options to handle network disconnections more promptly. Interval and presence deltas modes help manage large-scale channel activity by summarizing changes rather than reporting every event. Additional features allow for active/inactive channel notifications and state change events for sharing transient data, such as user preferences or application-specific data. PubNub's presence management lets developers define rules to manage which events are fired, enhancing scalability and performance.