What defines a variable expense in a budget?

A variable expense in a budget is characterized by its fluctuation in amount and the frequency of its occurrence. Specifically, it refers to expenses that can change from month to month, meaning that the amounts you allocate for these expenses are not fixed and can vary based on consumption, usage, or personal choices. Examples include groceries, utilities, and entertainment expenditures.

This concept contrasts with fixed expenses, which remain constant over time, such as rent or mortgage payments. Therefore, the correct answer highlights the variability in the monthly costs associated with these expenses, making it clear that they are not set amounts each month. Understanding variable expenses is crucial for effective budgeting, as it allows for adjustments based on changing circumstances and helps individuals maintain control over their finances.