Yes, that's correct! A CSS rule set consists of two main parts: the selector and the declaration block.

Here’s a detailed breakdown:

1. Selector:

The selector targets the HTML elements that you want to style. It can be any valid CSS selector, such as:

• Element selectors (e.g., p, div, h1),
• Class selectors (e.g., .class-name),
• ID selectors (e.g., #id-name),
• Attribute selectors (e.g., [type="text"]),
• Pseudo-classes (e.g., :hover, :first-child),
• Pseudo-elements (e.g., ::after, ::before).

  2. Declaration Block:

  The declaration block contains one or more declarations that define the style rules for the selected elements. Each declaration is a property-value pair, and each declaration is separated by a semicolon.