It's called "Opted in"

Wednesday November 30, -0001 comments

Many websites today utilize a “Sign-up Box” as a way of collecting email addresses of visitors, whether they are current or prospective customers. This gives a business a way of contacting these people in the future via email and engage with them. It’s called “opted-in” email and it’s big business.

Most opted-in email campaigns have one goal: to get you to return to their site often and purchase something, whether it’s a membership, product or service. Having a well placed “Sign-up Box” is imperative to building your data base of contacts.