Like bounce rates, having a high exit rate could mean that something is wrong with your page, for example; 404 page not found errors. The page you provide may not be fulfilling it’s intent, therefore causing users to leave your site.
Analytics tools will show you which page they ‘exited’ allowing you to examine why and to fix it to keep them viewing the website for longer or fulfilling a conversion.
However, a high exit rate could also mean that this was the natural exit page for your site, for example, call to actions such as ‘sign up here’ or ‘contact us’.
So it is important to differentiate between natural bounce and exit rates and when there is something seriously wrong with your content.