What is bounce rate in search engine optimisation? It is a term that is not used often on the web, but it is good to know how it is calculated and what it says about your website. Bounce rate describes the percentage of users that leave your website within few seconds from visiting it. High bounce rate generally means that content or design of your website is not appealing to end user. In worst case the pages might be optimised for the keywords that only seem to be relevant for your business.