Vape Tanks or Vape Pod, restore the E-liquid or Wax or Herb you want to vape. There are some types such as RTA, RDA, Atomizer, RBA, RDTA, Subohm tank.
RDA, normally means you can built the coil for yourself, and can`t restore E-liquid for long time, if you want to vape, you need to squeeze some E-liquid on the Wire Coil. It can make big vape cloud.
RTA, means it can use the wire coil or prebuilt-coil and restore E-liquid.
RDTA, it is combination of RDA and RTA.
Subohm Tank normally use prebuilt-coil, you can replace the coil more quickly and more easier, most of those coils are under 1.0ohm, so it can make big vape cloud too.