S stands for Cascading Style Sheets. It is used to control the appearance and layout of HTML elements on a website.
CSS can control properties such as colors, fonts, spacing, borders, widths, and responsive layouts.
For example:
h1 {
font-size: 32px;
margin-bottom: 20px;
}This CSS changes the size of an h1 heading and adds space below it.
In WordPress development, CSS is commonly used together with PHP and HTML to create the visual design of themes and templates.