To protect the boxers hands.
To protect theır knuckles from extra damage.
Two things. First, to protect your hands from any dangerous sample. Second, to protect your sample from contamination by your hands.
For strengthening the hand.
No. It's a myth.
During the 1920's boxers wore very thin gloves that barely had any padding on them. Today, the gloves are much thicker to protect the hands.
Bowers only punch Kick boxers use hands and feet
help add protection to knuckles and the bones in you hand
Baseball gloves do protect your hands with blisters, this is why many baseball players wear the gloves for long games in order to protect their hands.