Overgrips - a basic gude
This type of grip is wrapped over the top of the existing grip, and you will need to replace them more frequently than a replacement grip.
There are various types, the main differences being between a “DRY” or “TACKY” surface.
Some of these grips are perforated which are popular with some players.
There are many brands, and styles, which means you will have to experiment to find the one that you prefer.