Travel advances are pre-payments for expenses that you may incur on a trip. If you receive your advance in cash and in the currency of your destination country, you will be able to pay for expenses that are incurred immediately after you arrive, such as taxi fares.
Your request for a travel advance is linked to a requisition and must be approved before your trip can be booked. Then, when your trip is over and all expense reports have been created, you must return any surplus travel advance to your organization.