Below are the major  components of Angular 2

Modules − This is used to break up the application into logical pieces of code. Each piece of code or module is designed to perform a single task.

Component − This can be used to bring the modules together.

Templates − This is used to define the views of an Angular JS application.

Metadata − This can be used to add more data to an Angular JS class.

Service − This is used to create components which can be shared across the entire application.