Kotlin Collections

Collections are a container of data. Let's say you want to represent a collection of fruits, or a collection of vegetables, we can use the collections framework. Kotlin has both mutable and immutable collections.
Mutable collections can be modified and operations on them will not create a new collection.
Immutable collections will create a new collection when you perform operations on them.

Follow are important collection in Kotlin:

1. List - List contains ordered elements.
2. Set - Set is similar to mathematical set, it contains unique elements.
3. Map - Represents a key value pair collection, similar to a dictionary lookup.