What is a bounce rate?
If a website user only visits one page and then exits, they can be said to have ‘bounced’ out of the site. Bounce rate is the Google Analytics metric which captures this element of visitor behaviour. It is the percentage of visits that only include one page (or a single request to the Analytics server). […]
What is ‘Semalt’ and why does it keep sending visitors to my website?

Semalt is ostensibly a web analytics company offering a number of webmaster and search tools. However due to its spammy crawling techniques it may have a detrimental impact on a website’s site statistics and search engine page ranking.