A kitchen island is basically a countertop, but located right in the center of the kitchen, hence the name "island".
The good thing about having an island is to have free movement of the environment, however it is necessary to have a reasonable space in the environment.
Great for that support in food preparation and also as a countertop for quick meals.
It is a super useful element, to support the sink on the stove, and it is important to leave it well lit.
Models with a shelf help keep the kitchen organized.
A small island, for smaller spaces is an option for just the basics.
A good option for small spaces is to use a cart bench to support the sink and stove.