Newsletter template!

Which one is tough to do , template design, email template design, newsletter design and what is the main difference among them?

All templates are different with each other. Template design means template design for website like simple HTML template design. Email template design include few html tags and images which will show in attractive looks when someone open it in his inbox. Newsletter template is similar as email template but it is mainly for subscribed users who will get daily or weekly news in their inbox. this Template should have unsubscribe link if someone want to cancel subscription.