Concept Widget
Use the Concept widget to explain or reuse a particular concept in your lesson.
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The Concept widget is a named collection of Educative widgets/features that can be added to your Markdown only. This collection of widgets is meant to explain a particular concept in your lesson. You can reuse a concept anywhere in your course without having to make the widgets all over again!
Supported widgets
Currently, the following pre-defined widgets can be used in a concept:
- Markdown
 - Drawing
 - Array
 - Linked List
 - Binary Tree
 - Nary Tree
 - Stack
 - Hash Table
 - Graphviz
 - Sequence Diagram
 
It can load a collection of pre-defined widgets anywhere in your Markdown or text editor.
Edit mode
Consider a scenario where you want to create a concept on how to recursively calculate the factorial of a number.
Published mode
Here is an example of the concept: Binary tree and n-array tree are 
Clicking the arrow button opens the concept. Re-clicking it closes the concept.