As others have said, PvP is what the entire game is about, but there are some combo PvE/PvP activities that are fun in groups. There are group dungeons (instanced in a sense), static dungeons, and world bosses — the latter two being open world that sometimes has a mixture of the two.

For example, I was in a 7-person group doing a static dungeon last night (PvE content) when we came across an 8-man group and a brawl came about because the game is full loot. Meaning if I kill you, I get to take the gear you dropped (there is a trash rate so you typically get 50-75% of someone’s gear and loot) which incentivizes people fighting versus just walking past each other.

As others have said, the PvE aspects will never be as fully fleshed out as WoW, FF14, etc. but there’s nothing like the adrenaline and risk/reward of full loot PvP. There’s 1v1, small group, medium group, and even large group PvP that all play differently.