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The "Isolated Scope" Lesson is part of the full, Angular 1.x Essentials course featured in this preview video. Here's what you'd learn in this lesson:
Isolated Scope is the most important concept to understand when building more advanced directives. Isolated Scope prevents a directive from accidentally modifying the scope of its parent. It's essentially a directives API. Transclusion compiles the contents of an element and makes it available to a directive. Transcluded contents are bound to the parent scope while directive contents are bound to the isolate scope. These two contents are essentially siblings.