A live action role playing game  is also known as LARP and it is when a game played with participants and they physically portray whatever character they are assigned.
I've never heard of the term LARP!  What games are they?
The participants pursue their goals in the real world while staying in character and interacting with other characters.
Oh so it's not a video game?  Are they in a certain place or just anywhere?
Live action role-playing game
A live action role-playing game (LARP) is a form of role-playing game where the participants physically portray their characters. The players pursue goals within a fictional setting represented by the real world while interacting with each other in character. The outcome of player actions may be mediated by game rules or determined by consensus among players. Event arrangers called gamemasters decide the setting and rules to be used and facilitate play.
The first LARPs were run in the late 1970s, inspired
used in film and video to differentiate works with human actors from animation. Playing a LARP is often called "larping", and one who does it is a "larper".
Play overview.
The participants in a LARP physically portray characters in a fictional setting, improvising their characters' speech and movements somewhat like actors in improvisational theatre. This is distinct from tabletop role-playing games, where character actions are described verbally. LARPs may be played in a public or private area and may last for hours or