An expense is a cost incurred by an individual or organization in the process of acquiring goods or services. It represents the money spent to maintain operations, pay for necessities, or invest in future growth. Common examples of expenses include rent, utilities, salaries, and supplies. Tracking expenses is essential for budgeting and financial planning. By monitoring expenses, individuals and businesses can identify spending patterns, control costs, and make informed decisions. Proper management of expenses helps ensure that resources are allocated efficiently and financial goals are met.