What is Bounce rate?

Google refers to a "bounce" as "a single-page session on your site."

Bounce rate refers to the percentage of visitors that leave your website (or "bounce" back to the search results or referring website) after viewing only one page on your site.

As a rule of thumb, a bounce rate in the range of 26 to 40 percent is excellent. 41 to 55 percent is roughly average. 56 to 70 percent is higher than average.