Poco General FAQ - Explanation of EML extension

Q: Can someone explain the eml extension and how it applies to storage vs sending email? I've never used Outlook or any program that stores messages in this format. I gather it's a format that's used for stationery, fonts, etc. but would like more info.
An EML file is simply an RFC822 email file. It's not use for Stationary, fonts, or anything else -- it's just an email.