Pods are small containers that store e-liquids in closed- and open-system pod mods. They snap or screw into pod mod batteries, replacing spent pods that have been drained of their liquid and no longer produce vapor.
Both pods and cartridges use a simple snap in/out function that’s easy for new vapers to use, and both are designed to be replaced once empty (though open-system pod mods can often be refilled three or four times before they stop working).
Replacement pods and cartridges are necessities for anyone using pod mods or non-disposable cigalike vapor devices. Sooner or later, you’re going to need some replacements to keep you vaping.