# Builtin directives

SKDirectives are classes that add additional behavior to elements in your Angular applications. Use Angular's built-in directives to manage forms, lists, styles, and what users see.

`NgClass` Adds and removes a set of CSS classes. | `NgStyle` Adds and removes a set of HTML styles. | `NgModel` Adds two-way data binding to an HTML form element.


- [Understanding BuiltIn Directives](https://angular.io/guide/built-in-directives)
- [BuiltIn Directives Types](https://thinkster.io/tutorials/angular-2-directives)