Web, domains and email
RFC
Abbreviation for Request for Comments
In short and in plain language
An RFC is a public text.
It sets out the tech rules of the internet.
Many rules for email, domains and encrypted links are found in such texts.
Firms that host sites or run email usually follow them.
Definition
An RFC is a publicly available document that describes technical standards of the internet. Many rules for email, domains and encrypted connections are set out in such documents. Hosting and email providers usually align their technology with these specifications.