Q1. What is group selector?

Group selector applies same styles to multiple selectors separated by commas.

Q2. Why use group selector?

To avoid code repetition and write more efficient CSS.

Q3. Can different selector types be grouped?

Yes: .btn, button, input[type=submit] { } groups class, element, and attribute selectors.

Q4. Give example of group selector.

h1, h2, h3 { font-family: Arial; } applies same font to all headings.

Q5. Is there any performance impact?

No, group selector is efficient and recommended over repeating same styles.