PGN

@DarkStar said
What is PGN

Google is your friend:

In chess, PGN stands for Portable Game Notation. It's a standardized, plain-text format for recording chess games, including the moves and related information like player names, date, and result. Essentially, it's a way to store and share chess game data in a format that both humans and computers can easily understand.
Here's a more detailed breakdown:

Standardized Format:
PGN is a widely accepted format, meaning most chess software and websites support it for importing and exporting game data.

Plain Text:
PGN files are essentially text files, making them easy to create, read, and share.

Record of Games:
PGN files record the sequence of moves in a chess game using standard algebraic notation, along with metadata about the game.

Metadata:
Beyond the moves, PGN files can also include information such as player names, the date and time of the game, the location, the time control, and the result.

Easy Analysis:
Because of its standardized format, PGN files can be easily loaded into chess software for analysis, allowing players to study games, explore variations, and improve their play.

Sharing Games:
PGN files are also commonly used to share games with other players, coaches, or for publication.