What each term actually means
Email marketing is a broadcast
You write once, choose a segment, and send at a moment you decide. The message goes out from the brand, carries an unsubscribe link, and is measured across the whole audience: delivered, opened, clicked, converted. Its natural content is news that applies to everyone in the list at the same time, such as a launch, an offer or a newsletter.
An email sequence follows one person
A sequence is a set of steps that starts when a specific contact is enrolled. Delays are relative to that person, so a contact enrolled today receives step two three days from today. It sends from a rep, reads like ordinary correspondence, and its most important property is that it stops when the person replies.
