What is a group of islands called?

What is a group of islands called?

Why is an archipelago An archipelago is a group of islands. The archipelagos are generally found in the open sea, rarely close to a continent. They are often volcanic, and are therefore often along the submarine ridges or hotspots, but there are many other processes that can generate this phenomenon, including erosion and deposition of sediment.

A group of islands are called archipelago