| web browser | A software application for translating HTML documents into user-friendly webpages. Common web browsers include Google Chrome, Firefox, Safari, Internet Explorer, and Opera. |
| black box | A complex computer program that is poorly understood. Inputs and outputs can be observed, but there is no access to the process itself due to its confidential nature. For example, Google’s algorithm is a black box. |
| yelp | A business directory service that provides information (most of which is crowd-sourced) on local businesses. |
| link laundering | Noun phrase. The process of pointing large numbers of low-quality links at intermediary Websites which in turn link to primary destinations, consolidating the low PageRank of the low-quality links and converting it into higher PageRank. Sometimes referred to as Link Layering, Link Pyramidding, and/or PageRank Funneling. |
| term frequency-inverse document frequency | (TF-IDF) A measurement used by Google to determine how important a keyword is on a webpage by comparing its frequency and usage on other webpages. |
