An unsecured creditor is like your little brother or sister who you promised to give a candy to but didn't give them a specific time frame or deadline. They don't have any special or specific claim or collateral to back up the money that they lent you. This means that they can't take anything away from you to get their money back, unlike your parents who can take away your toys or games if you don't follow their rules.
For example, imagine that you borrowed $10 from your little brother or sister, and promised to give them the money back whenever you have some extra cash. Since they have nothing to hold onto or claim, they have no legal right to get their money back from you. In this situation, you could easily forget to pay your little brother or sister back, and they couldn't do anything about it legally.
So, an unsecured creditor is someone who lends you money or has a claim against you, but they have no legal claim or protection to get their money back if you don't pay them back.