Raids are the pinnacle of endgame content these are not matchmade activities which means you need to find 5 other players to go into these with these are heavily influenced by mechanics to complete these encounters but the loot from them is the best in the game.
When the Destiny 2 forsaken launched a new raid was released with it. The name of the raid is called Last wish.
When Destiny 2 shadowkeep released on october 1st 2019 it brought with it a new 6 player raid. To watch the full raid check out the video below.
With the release of Beyond light back in November of 2020 Bungie released a new raid along with a new destination on the Icy moon Europa. Called The Deep Stone Crypt check out the video below for a full run.
When season of the splicer started Bungie brought back the first raid they ever created the Vault of Glass. To see a full run check out the video below.
With the release of the Witch queen Dlc just recently in February of 2022 a new raid was released and I think this is one the best the developers have made. If you want to see the raid check out the video below.