Web, domains and email
IETF
Abbreviation for Internet Engineering Task Force
In short and in plain language
The IETF is an open group from around the world.
It writes the tech rules for the internet. Its papers describe, for example, ways to check email.
For a small firm, they are mainly a base. Providers use them when they set up email.
Definition
The IETF is an open international body that develops technical standards for the internet. Its documents are called RFCs and describe, for example, email procedures such as SPF, DKIM and DMARC. For a small business they are mainly the basis that providers rely on when setting up email sending.