| gray hat seo | SEO strategies that toe the line of search engine guidelines. They are questionable, but not as clearly in violation of guidelines as black hat SEO tactics. |
| null query | Noun phrase. A null query produces no relevant documents as a search result. Alt. A null query may include only documents with null relevance (q.v.). |
| submission | The act to submitting a URL for inclusion into a search engines index. Unless done through paid inclusion, submission generally does not guarantee listing.Submission can be done manually through an online form or automated, where a software program or online service may process the forms behind the scenes. |
| viral | the term used to describe content that has been shared rapidly many hundreds, thousands or millions of times across the internet, primary on social media. |
| panda | A Google algorithm update that targeted low-quality content. |
