What does "Raid" mean in World of Warcraft?

Attacking the Allies
Skills training
Trade between races
Dungeon Campaign

Info: Raid is a group of players gathered to enter the especially dangerous and difficult dungeons or participate in the largest PvP battles. The number of raids can reach up to 40 people, which are divided into groups of five raiders in each.

About this trivia

Trivia about "World of Warcraft" game, sometimes also called WoW, is a global multiplayer online role-playing game (MMORPG) developed by Blizzard Entertainment, which gave life to the Warcraft universe. In 2008, World of Warcraft counted more than 11.5 million subscribers and to this day is included into the Guinness Book of Records as the world's most popular and largest MMORPG.