Reference.com, produced by Dictionary.com, LLC, is an online encyclopedia that provides detailed definitions from a variety of other encyclopedias. In other words, reference.com does not write encyclopedia entries, they simply present entries from other popular encyclopedias in response to a query. Since this site gathers resources from other encyclopedias it is able to provide in depth and impartial facts that can be compared from source to source; and since it exists among other Dictionary.com, LLC language reference products, other types of information are conveniently within reach. This website registers hundreds of millions of page views per month world wide and receives most of its traffic from the United States.

The homepage consists of a search bar at the top and a ‘word of the day’ section which displays a defined and translated word, and contains links for signing up to receive a word of the day via email. There are also links to puzzles, a translator, a multilingual dictionary, medical, legal and reverse dictionaries, podcasts, featured articles and several other language resources.

Although the entire site is accessible without registration, there is a premium registration option available that provides faster browsing with no ads; there is a fee for premium registration.