Hi Dieseler & welcome
What TC allows you to do is hold your finger on the fire button longer than if you are in power mode. In power mode the coil would quickly get too hot and start to burn your wick & juice. In TC mode the mod shuts the power down to keep the coil from getting too hot and you can take a longer breath and get more vapor.
A pod mod is just the battery part of a vape that has a replaceable disposable juice pod on it.