Basic Seo concept: What is a wrong link?

The link does not exist at all, that isError Link.

The difference between the error link and the dead link:

• The error link is due to user negligence and the requested link does not exist.
• The dead link is the original access normal, and later cannot be accessed because of changes in the website.

Error link:

1. The user has misspelled the domain name.
2. The URL address is incorrectly written.
3. The URL suffix is redundant or missing.
4. The uppercase and lowercase letters in the URL do not match exactly.

For more details, click "error link"

From: http://www.seowhy.com/