The canvas element has no appearance of its own but creates a drawing surface within the document and exposes a powerful drawing API to client-side JavaScript.
Most of the Canvas drawing API is defined not on the canvas element itself, but instead on a “drawing context” object obtained with the getContext() method of the canvas.
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What is the returning value of the getContext() method?
Call getContext() with the argument “2d” to obtain a CanvasRenderingContext2D object that you can use to draw two-dimensional graphics into the canvas. It is important to understand that the canvas element and its context object are two very different objects.
