An expense report is a document used by employees to itemize and request reimbursement for expenses incurred while performing work-related duties. This can include costs for travel, meals, lodging, and other business-related expenses. The report typically requires receipts and may need to follow specific guidelines set by the employer. Companies often use expense management software to streamline the process of submitting and approving these reports. This software helps track expenses, ensures compliance with company policies, and simplifies the reimbursement process for both employees and finance departments.