In order to understand bounce rate let’s first understand what bounce means. According to Google, a bounce is,
“A bounce is a single-page session on your site. In Analytics, a bounce is calculated specifically as a session that triggers only a single request to the Analytics server, such as when a user opens a single page on your site and then exits without triggering any other requests to the Analytics server during that session.”
Bounce rate can be calculated by dividing single-page sessions by all sessions, or the percentage of all sessions on your website in which users viewed only a single page and triggered only a single request to the Analytics server.
If your overall bounce rate is high, then you can analyse your website to see whether it’s uniformly high or whether it’s the result of something like source/medium pairs, one or two channels, or just a few pages.