Video Games Encyclopedia

An action-adventure game is a video game hybrid genre that combines core elements from both the action game and adventure game genres.
An action adventure game can be defined as a game with a mix of elements from an action game and an adventure game, especially crucial elements like puzzles inspired by older adventure games. Action-adventures require many of the same physical skills as action games, but may also offer a storyline, numerous characters, an inventory system, dialogue, and other features of adventure games. They are typically faster-paced than pure adventure games, because they include both physical and conceptual challenges. Action-adventure games normally include a combination of complex story elements, which are often displayed for players using audio and video. The story is heavily reliant upon the player character’s movement, which triggers story events and thus affects the flow of the game. Popular examples of action-adventure games include The Legend of Zelda, God of War, Grand Theft Auto, and Tomb Raider series.

Reference: Wikipedia