A security deposit is a sum of money that a tenant pays to a landlord before moving into a rental property. This deposit serves as a financial safeguard for the landlord against potential damages or unpaid rent. Typically, the amount is equivalent to one month's rent, but it can vary based on the rental agreement. When the tenant moves out, the landlord inspects the property. If there are no damages beyond normal wear and tear, the security deposit is usually returned in full. However, if there are issues, the landlord may deduct repair costs before returning the remaining amount to the tenant.