What are coffee pods? Someone told me to use them in my coffee machine?

Some coffee machines have the option to either use ground coffee and filters or coffee pods. These are small, sealed containers that have the ground coffee inside. You insert the pods into the machine and click them into place. The machine pierces a hole and the water drips through. It's a much tidier way to make coffee especially if you don't drink a lot of it, so you don't want a whole jug full, rather just one cup at a time.