| url parameter | The values added to a URL in order to track where traffic comes from (i.e., which link someone clicked on to discover your website or webpage). Here’s an example of a URL parameter (bolded): |
| comment spam | Poorly written comments, often off-topic and self-promotional, posted by spambots in the hopes of getting a free (but ultimately worthless) link. |
| 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. |
| delisting | When a web page or pages are removed from a search engine directory. This can be temporary or permanent, and can happen for any number of reasons including a penalty from the search engine, a change in search engine crawl priorities, or a change in location of the page in question. |
| wordpress | A popular blogging and content management system. |
