A mod is basically a vape term for a ‘modified’ vaping device. In the early days of vaping, when devices first started moving away from traditional e-cigarettes and vape pens to being a little bit more customizable, they were called vape mods for their modification of original blueprints and templates for vaping device design. Now, mod is simply a manufacturing term that has stuck around and comes to describe all the fancy and advanced vaporizers that you see on the market (you should definitely check out Urban Vape most popular Mod)