What happens if you do not have enough money in your checking account to cover the amount of the check you wrote?

If you do not have enough money in your account, the cheque would bounce. Which means your account does not have sufficient funds to honour the cheque you issued to somebody. In this situation the bank would return the cheque to the person who deposited informing that there is not enough funds. Also the bank would charge you a penalty fees for issuing cheques without enough funds in your account. Now, the person who received the cheque from you can file a legal complaint on you and you can be jailed for issuing such cheques.