What is the World of Warcraft?
World of Warcraft (WoW for short) is a Massive Multiplayer Online Role-Playing game (MMORPG) first published by Blizzard Entertainment in 2004, and regularly update with expansion packs and updates since that time. As a massively-multiplayer online game, hundreds of players engage in the same digital environment with capability to compete with, cooperate with, or form communities with, a wide range of other players.
WoW gameplay has enormous variation with different players focusing on character progression and increasing power, and overcoming challenges through combat whether against the game AI (Player versus Environment or PvE) or in competition with other players (Player versus Player or PvP).
PvE content includes open-world activities which are usually conducted individually, or organised groups in Dungeons (typically five-person teams) and Raids (teams of ten or more players, or a fixed roster of 20 players for Mythic level Raids).
PvP content can also occur in the open world for players who have chosen to enable PvP for their character, or in organised content including two and three player arena combat, and battlegrounds with larger teams of dozens of players.
Some players also choose to focus on activities other than combat and character power, including performative role-playing of character personas, collecting gold, titles, achievements, pets, mounts and character appearances (and more!).
Current Content
Since launch there have been eight expansion packs added to the game, the latest being the Shadowlands expansion pack released in November 2020. Each expansion pack also receives several major updates, including new zones, new game mechanics or other player abilities, new PvE Raids and Dungeons, and a new PvP season.
The next major update is the first Shadowlands update (Patch 9.1: Chains of Domination) which is expected to hit live servers in c.July 2021. The patch is currently (as of June 2021) in testing on the Public Test Realm (PTR) which interested players can access.
Major Resources
Player Help Sites

Wow Progress
WowProgress is a World of Warcraft ranking website with a focus on both Raid and Mythic+