A component controls a patch of screen called a view. Component decorator allows you to mark a class as an Angular component and provide additional metadata that determines how the component should be processed, instantiated and used at run time.
Components are the most basic building block of an UI in an Angular application. An Angular application is a tree of Angular components. Angular components are a subset of directives. Unlike directives, components always have a template and only one component can be instantiated per an element in a template.You can see more information on components here
- https://angular.io/api/core/Component (For Angular 2+)
- https://docs.angularjs.org/guide/component (For Angular JS)
