| qdf | Stands for query deserves freshness, where a search engine might decide to show newer webpages in search results (rather than older pages) if a particular search term is trending, perhaps because a news event has resulted in a surge in searches on that topic. |
| structured data | Another way to say organized data (as opposed to unorganized). Schema.org is a way to structure your data, for example, by labeling it with additional information that helps the search engine understand it. |
| alt tag | ALT text is an alternative text associated with an image, used by web browser agents that cannot display graphics. Basically, alt text ensures that your web page is visible and accessible and no functionality is lost, even if the viewer has turned off images or uses a screen reader. The Alt attribute is a description of an image in your sites HTML. For instance, people with impaired vision can still interact with that image due to this feature. |
| google hummingbird | A Google search algorithm that was officially announced in September 2013 after it had been in use for a month. The purpose of Hummingbird was to better understand the full context of queries (i.e., semantic search), rather than certain keywords, in order to provide better results. |
| disavow links | Disavowing links is the process of telling Google that you do not want the links to count towards your site. For example if you feel that the links are spammy, or that they had been purchased as part of a previous SEO campaign and you need to now tidy them up. You can disavow links via the Disavow tool in Search Console. |
