What's that thing called & what is its purpose?

This is an electrical question. I'm looking for the name of that fixture you put in a light-bulb socket. It screws into the socket & has a flat end in it. It doesn't light up like a bulb, it just goes into the socket. I don't know what its function is, either. Does anybody who reads this know what... show more This is an electrical question. I'm looking for the name of that fixture you put in a light-bulb socket. It screws into the socket & has a flat end in it. It doesn't light up like a bulb, it just goes into the socket. I don't know what its function is, either. Does anybody who reads this know what I'm referring to? If you do, I'd appreciate your help on this. I know next to nothing about electrical things, just enough not to poke things into an outlet, how to tell if I've got a short circuit somewhere in the wiring, and the obvious, that water & electricity don't mix. Thanks for your help! 😀 God bless you.
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