If I ask you what a can opener is, and you say
A can opener is a service component that affords access to preserved fruits and vegetables.
This does not help me at all. I am looking for something along the lines of
A can opener is a handheld metal tool that cuts the lids off of canned food, which you can buy at the grocery store. You use it by turning a knob, which puts pressure on two blades, which cut through the metal lid of the can.
Thank you.