All issues found during a crawl will be categorized by type in the Site Auditor. The Issues by Type chart can help identify which types of issues are most common on your site by showing the number of URLs affected by each category.

There are 7 types of issues in the Site Auditor:
Content
Issues regarding content visible on the page to site visitors
Redirects
Issues regarding redirected content
Meta Data
Issues with meta tags, such as Title, Meta Description or Meta Keywords
Optimization
URLs that have been assigned targeted keywords, but the keywords were not found in the main content areas of the page.
Visibility
Issues associated with content being accessible to search engines
Errors
Issues where content is not available due to errors
Other
All other issues that don't fit into one of the above categories