A more thorough explanation:

Definition: An island is a piece of land that is surrounded by water but is smaller than a continent. It is usually surrounded by water all the time, except during unusual events like floods or storms.

Examples:

• Hawaii is a group of islands in the Pacific Ocean.
• Madagascar is an island off the coast of Africa.
• Manhattan is an island in New York City.

The examples illustrate the definition of an island by showing different types of land masses that are surrounded by water. Hawaii is a group of islands, while Madagascar is a single island. Manhattan is an island that is part of a larger city. All of these land masses are surrounded by water and are smaller than a continent.