10. What is the `<canvas>` and what is it used for?

The <canvas> tag in HTML is used for drawing graphics using scripts, typically JavaScript. <canvas> allows for the dynamic creation and manipulation of graphics, animations, charts, and other visualizations.

Example of using <canvas>:

1. Drawing a rectangle:

<canvas id="myCanvas" width="200" height="100" style="border:1px solid #000000;"></canvas>
<script>
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.fillStyle = "#FF0000";
ctx.fillRect(0, 0, 150, 75);
</script>

The <canvas> tag is useful for creating interactive web applications that require advanced graphics, such as games, image editors, and data visualization tools.