No. A cartomizer is a device that can be used on its own. It is basically an atomizer device tucked inside dense foam which wicks juice to the atomizer in the center. Some cartomizers are "punched" which exposes the wicking material so that they can be placed in a tank (aka a "cartotank" when a carto is used in a tank) and the juice wicks into the cartomizer via the punched holes or slots in the outer metal casing of the cartomizer. A clearomizer works similarly but doesn't employ the use of a "cartomizer" per se. A clearomizer is just a tank/reservoir that wicks into an atomizer head directly. The atomizer in a clearo can be bottom fed, top-fed with wicks, or be encased in a center section that very closely resembles a cartotank setup (examples of this latter example would be an Aspire BDC clearomizer). At some point the line between the two types of setups blurs quite a bit. Cartomizers and related "cartotanks" do have a bit of a learning curve but when done properly, rival even top-end RBA setups.