MDN, short for Mozilla Developer Network, is an online resource for developers who want to learn and build with open web technology. There are several synonyms for MDN that can be used interchangeably depending on the context, including: Mozilla Web Docs, Mozilla Developer Center, Mozilla Developer Hub, Mozilla Developer Portal, Mozilla Developer Resources, and Mozilla Developer Network Documentation. These synonyms refer to the same platform and offer a wealth of information and resources on web development, such as documentation, tutorials, and tools, as well as community support and engagement for developers of all levels. Whichever synonym is used, MDN represents a powerful resource for anyone looking to develop for the web.