An action where the person creates an alternative or additional content for a specified game. People use programs and tools to build these mods and share it freely to the a mod site or a forum.
"Hey guys, i built this mod with a game modding tool that gives you extra weapons and armor. you can have the mod for free and i am absolutely not selling it because mods are supposed to be free, otherwise its called DLC"
What every horny 12 year old that doesn't know what Pornhub searches on youtube when they wanna flick their bean.
Horny 12 Year old: *types Video Game Nude Mod into the Youtube search*
Horny 12 Year old: Omg this Skyrim Sex mod is so hot!