CSS stands for Cascading Style Sheets. It is a stylesheet language that is used to describe the presentation of a document written in HTML or XML². CSS can be used to style and layout web pages, such as changing the font, color, size, and spacing of the content, creating multiple columns, adding animations, and more³.

To use CSS in a web page, you need to link it to the HTML document using one of the following methods:

• Inline style: You can use the style attribute inside an HTML element to apply CSS rules to that element only. For example:

• Internal style sheet: You can use the style element inside the head element of the HTML document to define CSS rules for the entire page. For example:

• External style sheet: You can use the link element inside the head element of the HTML document to link to an external CSS file that contains the CSS rules for the page. For example:

The advantage of using an external style sheet is that you can reuse the same CSS file for multiple web pages, and maintain a consistent look and feel across your website¹.

A CSS rule consists of a selector and a declaration block. The selector specifies which HTML elements to apply the style to, and the declaration block contains one or more declarations that define how to style those elements. Each declaration consists of a property and a value, separated by a colon and ending with a semicolon. For example: