What are directives in AngularJS?

Instruction: Define what directives are in AngularJS and give examples of common directives.

Context: This question tests the candidate's knowledge of AngularJS directives, their purpose within the framework, and their ability to provide examples of how and when they are used.

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A directive tells AngularJS how to attach behavior to matched template markup during compilation and linking. Depending on its definition, it can match an element, attribute, class or comment. A custom element-shaped directive is not automatically a browser Web Component.

Common examples include ngBind for text output, ngModel for supported form-control binding, ngClick for an event expression, ngIf for conditional creation/removal, and ngRepeat for repeated templates...

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