| hreflang | A tag that indicates to Google which language the content is in. This helps Google serve the appropriate language version of your page to people searching in that language. |
| crawl depth | The crawl depth is the extent to which a crawler indexes the pages on a website. When a crawler accesses you website, it keeps digging through the links. A page can have subpages and those subpages have subpages of their own and so on. Its similar to how folders and subfolders work on your storage. |
| supplemental index | Supplemental Index refers to Googles secondary database containing pages considered to have less importance. The importance of a page is measured by the number of links pointing to it. If, according to Googles algorithm, a page is depreciated, it will not pass to the target page. It will appear on a supplemental page that will rank in search results only if there are not enough pages in the main index. Supplemental results are rarely rank and, thereby, they dont pull much weight in Google. |
| bots | Also known as crawlers or spiders, these are what scour the Internet to find content. |
| security protocol | HTTPS is the secure version of HTTP, a protocol of the World Wide Web. It encrypts session data over SSL or TLS protocol instead of using plain text in socket communications. Basically, a website that uses HTTPS is safer as it is encrypted and thus makes it safer for you to visit that website. |
