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There are three special email templates per website which can be configured to be sent either manually or automatically at particular stages once a customer has completed a booking. They can be edited in Channel Manager > Email templates and can contain data regarding the customer, product and booking by using tags as explained in the Documentation manual (Emails / Invoices).
The three templates are:
The templates are sent as HTML, so you can use HTML tags for things like headings, lists or adding images. Learn more about HTML / CSS email use in email templates.
These are just the website specific emails for particular stages of the booking process, you can load an unlimited amount of email templates for manual sending by heading to Configuration & setup > Booking templates (Email).