This document defines key concepts in tabletop roleplaying games (TRPGs) such as the difference between TRPGs, other roleplaying games, and digital games. It also distinguishes between events, gameplay, and fiction in TRPGs. Additionally, it outlines different methods for altering the fiction through gaming, roleplaying, and authoring. Finally, it identifies various motives for player actions such as catharsis, immersion, and agon that relate to different play styles and types of enjoyment sought through gaming.