Instruction: Describe what transclusion is and how it is used in AngularJS directives.
Context: This question probes the candidate's knowledge of advanced AngularJS features, specifically transclusion, which allows for the creation of complex directive templates.
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Transclusion is a core feature in AngularJS that allows us to embed a clone of the original content inside a directive's template, preserving the scope from where the content originates. This is particularly useful when designing complex and customizable directive templates that can include external content seamlessly.
For instance, when building a UI component like a modal or a tooltip, you might want the flexibility to include custom content inside these components. AngularJS transclusion makes this possible without losing the context of that content. It essentially allows for the projection of content into a component from the outside, which is a powerful pattern for creating highly reusable...