Vape devices contain three main components which are the battery (heats up atomizer), the atomizer (heats up substance) and the tank (contains substance).
Mods are high-tech units that contain the battery portion of a vaporizer. Some mods have built-in rechargeable batteries while others use replaceable rechargeable batteries. They have evolved to contain features that allow for a more customizable vaping experience. Mods are considered advanced units and can be dangerous if mishandled or misused.