Fireteams, encounters and why a run needs the right group
A Destiny 2 raid is a set of encounters with mechanics that every player in the fireteam has to know. One Guardian missing a callout can wipe the group, which is why looking-for-group runs so often end at the first boss. A fireteam that has cleared the raid before turns that into a single evening.
Raid and dungeon runs bring that fireteam to your own character, so the loot, the triumphs and the clear are yours.
For activities without a clear to chase, Destiny 2 GGirls join on voice for patrols and strikes. More looter games are collected on the World of Warcraft hub and the ARC Raiders hub.