Bounce rate, in Google Analytics GA4, measures the percentage of visitors who leave a website after viewing only one page. It indicates the effectiveness of a website in engaging visitors and encouraging them to explore further pages. A high bounce rate suggests that visitors did not find what they were looking for or did not have a good user experience. It is important to analyze the causes of a high bounce rate, such as slow page load time, irrelevant content, or confusing navigation, and take steps to improve it. By optimizing the website's design, content, and user experience, it is possible to lower the bounce rate and increase visitor engagement. Regular monitoring and analysis of bounce rate can help businesses improve their online presence and achieve better conversions.