The term “zombie pages” is not some clever acronym or some quirky name given to something that doesn’t work. Zombie pages are a bit of a threat for every website, and their name describes their function – or lack thereof – perfectly.
But what are they, exactly?
The best way for me to answer that question would be a visual representation. So, let’s assume that you hop on Google and that you search for your indexed pages:
If that number at the bottom seems to be too high, maybe you’re in for a small surprise that could harm your SEO efforts. Luckily, this is not uncommon, as more than most websites have this “too high a number” of indexed pages…
Read the complete article at https://blog.linkody.com/seo/zombie-pages-a-survival-guide.