The percentage of visitors to a website that leave immediately without clicking or interacting with any portion of the page. It often happens that you click on a random link and you end up on a website that you are not interested in anyway. Even though you immediately leave that website, your visit still counts in website analytics. Congratulations, you have just contributed to the bounce rate of that website! In other words, bounce rate is the percentage of visitors that have landed on your website but have not stayed long enough or clicked on other pages.
For example, if 100 people visit a website, and 50 of them immediately leave, the website has a bounce rate of 50%. Websites aim to have as low of a bounce rate as possible, and averages tend to be anywhere between 40-60%.
It's also calculated as the percentage of single-page sessions in which there was no interaction with the page before the visitor leaves the page. A bounced session has a duration of 0 seconds. A high bounce rate generally leads to poor conversion rates
Another aspect of bounce rate is "email bounce rate", it refers to the percentage of emails that are unable to be delivered to a recipient’s inbox. A high email bounce rate may mean that your email lists are not up-to-date and include invalid email addresses. Email bounces are not necessarily bad. There are generally two types of email bounces: hard and soft. A hard bounce is when there is a permanent problem with the address, and the email cannot be delivered. A soft bounce is a temporary issue with the address and may eventually be resolved. If a soft bounce exists for long enough, it is considered a hard bounce.