HTML Colors are used to add color to text, background etc. It is defined by the predefined color name. Please see the below example to get better knowledge about color.
A color name can be color names, or RGB, HEX, HSL, RGBA, HSLA values.
You can chnage the text color in HTML.
<!DOCTYPE html>
<html>
<body>
<h3 style="color:green;">Students Tutorial</h3>
<p style="color:brown;">Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.</p>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title>Color Example</title>
</head>
<body>
<h1 style="background-color:green;">HTML Tutorial</h1>
<div style="background-color:orange;">
<p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam erat volutpat.
Ut wisi enim ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl ut aliquip ex ea commodo consequat.
</p>
</div>
</body>
</html>
In HTML you can set the border color.
<!DOCTYPE html>
<html>
<body>
<p style="border: 2px solid blue;">Hello World</p>
<p style="border: 2px solid green;">Hello World</p>
<p style="border: 2px solid orange;">Hello World</p>
</body>
</html>