Bounce rate is the percentage of single-page visits (i.e. visits in which the person left your site from the entrance page). Bounce rate is a measure of visit quality and a high bounce rate is generally interpreted to mean that the site entrance or landing pages are not relevant to your visitors or of poor quality.

However, there are some situations where a high bounce doesn’t necessarily mean the site entrance or landing page is irrelevant or of poor quality:

• The information the visitor is seeking is located on the site entrance or landing page. In this instance, a high bounce rate could be seen as a positive.  
• The site has well-targeted ads which the visitor clicks on immediately upon arriving at the site.

As always, it’s important to analyze key performance indicators in context, factoring in relevant information such as the overall objective of the site, etc.