What is a budget? i dont know

A budget is an estimate of income and expenditure for a set period of time.

Budgeting is the process of creating a plan to spend your money.

Explanation:

A budget is an estimation of revenue and expenses over a specified future period of time and is usually compiled and re-evaluated on a periodic basis. Budgets can be made for a person, a family, a group of people, a business, a government, a country, a multinational organization or just about anything else that makes and spends money.