facts / fax are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
facts: (noun) a piece of information about circumstances that exist or events that have occurred. (noun) a statement or assertion of verified information about something that is the case or has happened. (noun) an event known to have happened or something known to have existed. (noun) a concept whose truth can be proved.
fax: (verb) send something via a facsimile machine.
facts: f·AE·k·t·s
fax: f·AE·k·s
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)