Have you ever gone to a party or event, took a quick look, and decided to just leave? Did you ever think later what if I missed out on something? Or what I was just being too judgmental? Chances are probably not. You made your decision and went with it.
Your “bounce rate” is the same thing when it comes to your website. It’s the percentage of visitors who come to your website (home page, blog post, sales page, landing page, etc.) and leave without engaging with any content, filing out your opt in form, or clicking through to another page.