Video Games Encyclopedia

A battle royale game is an online multiplayer video game genre that blends last-man-standing gameplay with the survival, exploration, and scavenging elements of a survival game. Battle royale games involve dozens to hundreds of players, who start with minimal equipment and then must eliminate all other opponents while avoiding being trapped outside a shrinking “safe area”, with the winner being the last player or team alive.
The name for the genre is taken from the 2000 Japanese film Battle Royale, itself based on the novel of the same name, which presents a similar theme of a last-man-standing competition in a shrinking play zone. The genre’s origins arose from mods for large-scale online survival games like Minecraft and Arma 2 in the early 2010s. By the end of the decade, the genre became a cultural phenomenon, with standalone games such as PUBG: Battlegrounds (2017), Fortnite Battle Royale (2017), Apex Legends (2019) and Call of Duty: Warzone (2020) each having received tens of millions of players within months of their releases.

Reference: Wikipedia