Video Games Genre

What is a genre?

A genre is a category of literature or other form of art or entertainment (such as paintings or music) based on certain defining criteria.

Genre in video games refers more into the gameplay, and not into the story like a movie is.

But why is it different?

Why is a genre defining video games so different from defining a movie?

let's look at it this way, 

you are chilling with your friends in a cafe and one of your friends suddenly brings up this question "Hey guys, wanna watch a movie in the cinema? i heard about this new movie that's suppose to be really good" and your other friend said "yeah sure, what's it about?" "i don't know, but i heard that it's a first person shooter, adventure, puzzle movie."

wouldn't that be weird to hear? but what if they are talking about a game? it wouldn't be as weird.

saying a game to be a first person shooter, action, adventure game.