You can create discount codes for tickets/registration that you can provide to your ticket buyers to receive a discount on all or select tickets.
Discount codes can be set for either a fixed dollar amount off or a percentage off either the entire order or designated tickets.
You can also specify total uses of each code and the date range for which a code is valid (start and end dates). You can have one or more discount codes active at any given time.
The way a discount code works is that, once you have set it up and it is active, a ticket buyer can select their tickets and, if the code applies to the tickets selected, they can enter the code while completing the Checkout Form and the discount will be applied accordingly.