We can create different types of email templates in Salesforce. Some of them are listed below:
Custom HTML: Custom HTML templates can be created without any letterhead by the users or Administrators that have “Edit HTML Templates” permission.
HTML with letterhead: Any user that has the permission of “Edit HTML Templates” can create such letterhead-based email templates
Text: This template can be created and changed by any user
Visualforce: This template can be created by only administrator or developers. In this template, multiple records merging feature is also available.