What is Map?

• A Map is collection of key and value.

• A key are unique within a map.

What is classes?

• A Dart is a object oriented language so you can define classes to model your data.

• classes are blueprints for creating objects.

• objects by encapsulating data and methods.

What is Json?

• A json is a java script object notion json is create a pass to api call data in json file.

• A json is a map data excecution in json.

• A json data encode and decoding your data.