Corded Drill: What's the difference between a keyless chuck and a regular chuck?

My husband wants a corded drill for Christmas even though we have a cordless one, so he doesn't need to deal with battery when assembling shed. I'm only looking to spend like $30 on it since it will barely be used In shopping I keep seeing keyless chuck, what does this mean and do I want that? THANKS! show more My husband wants a corded drill for Christmas even though we have a cordless one, so he doesn't need to deal with battery when assembling shed.
I'm only looking to spend like $30 on it since it will barely be used
In shopping I keep seeing keyless chuck, what does this mean and do I want that?

THANKS!
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