Mods come by themselves (without a tank) and are the more advanced version of vapes in the electronic cigarette (e-cigarette) world.
Most mods allow you to hone in your preferences with setting the  wattage, temperature, coil material and many other advanced options or adjustments. This can really help you to find the right flavour notes in your e-liquid. 
Vape mods come in a range of sizes and while some have internal batteries, most almost always require replaceable batteries that are not included in the box. You'll also need to buy avape tank separately or purchase one of ourvape mod kits.