Define bounce rate in Google Analytics.

The correct choice accurately defines bounce rate as the percentage of single-page sessions in which users leave the site without any interaction. In Google Analytics, a session is considered a bounce if the visitor enters your website on a particular page and exits without navigating to any other pages or performing any actions such as clicks, form submissions, or other interactions.

This metric is important because it can indicate the effectiveness of a landing page; a high bounce rate may suggest that users are not finding what they expected or that the content is not engaging enough to encourage further exploration of the site. Understanding bounce rate helps website owners assess user engagement and identify pages that may require optimization to keep users on the website longer.