Budget
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 group of people, a business, a government, or just about anything else that makes and spends money.
To manage your monthly expenses, prepare for life’s unpredictable events, and be able to afford big-ticket items without going into debt, budgeting is important. Keeping track of how much you earn and spend doesn’t have to be drudgery, doesn’t require you to be good at math, and doesn’t mean you can’t buy the things you want. It just means that you’ll know where your money goes, you’ll have greater control over your finances.
Reference
Investopedia Website