The newsletter subscription feature describes the functionality and way that people using your website can subscribe (or unsubscribe) from your newsletter.
This needs to be well designed to fit into your site and attract as many people as possible to sign up for your newsletter.
Once the person signs up and gives their email address, a confirmation screen is shown and email is sent to confirm the action.
The user can also sign up for the newsletter from any contact page or throughout the sales process.