What is CSS?

CSS (Cascading Style Sheets) is a style sheet language used to describe the presentation of a document written in HTML or XML. CSS describes how elements should be displayed on screen, on paper, in speech, or in other media.

Importance of Selectors

Selectors are patterns used to select the elements in the document tree to which styles will be applied. They are fundamental because they allow designers and developers to apply specific styles to specific elements efficiently.

Basic examples of selectors

Structure of a CSS rule

A CSS rule is composed of a selector and a declaration block. Here is a detailed example:

For example, if you want all paragraphs to have red text, you would use:

Conclusion of the topic

Selectors are an essential part of CSS as they provide a way to control and manipulate the styling of individual elements without altering the HTML. Understanding how to use them efficiently is crucial for any web designer or developer.

This first topic of the course lays a solid foundation for the upcoming chapters, where we will explore more specific types of selectors and advanced techniques to control web page design more effectively.