PvE
From Destiny 2 Wiki
PvE (an abbreviation of Player versus Environment) is an umbrella term for various in-game activities that pit players against computer-controlled enemies. These activities vary in scope and can be anything from quests to dynamic field events to endgame raids. Note that under no circumstances will a player find him or herself forced into combat against another player-controlled character; this type of content is known as PvP (Player versus Player) and is wholly separate from other activities.
PvE content in Destiny 2 is divided into several distinct activities.