A check is a written, dated, and signed instrument that directs a bank to pay a specific sum of money to a payee. When you write a check, you are requesting that the bank pay the recipient the amount of money specified on the check. The recipient can then present the check to their bank, which will transfer the funds from your account to their account.
Checks are a common way to make payments in the United States and many other countries. They are generally considered to be a more secure and formal way to pay than cash, as they provide a written record of the transaction.