It's not just lack of Quality content, but it has so many things like design of the website, images, videos in a post. The loading of a webpage is very important, if that is not in range, then Search engines too pushing back to the search results page.Bounce rate record the activity of the users which comes to website for small time span and no other activity like visit some other webpage etc.
Bounce rate increases when lack of quality content and promote the content in wrong way. So if bounce rate is increases then it may be harmful for website.
That is why low bounce rate is referred as "Good" and high bounce rate as "Bad" for a site. So we should have try to make our site attractive for audience engaged to get improved bounce rate (low bounce rate)Bounce rate refers to the number of visits or web sessions wherein a single person leaves your website from the entrance page and not interacting any further within the page. it is then the Google analytics that calculates and reports the bounce rate.