Loan default is a default on a loan agreement, i.e. failure to timely pay interest or principal on a debt obligation or under the terms of a bond issue agreement. Consequently, a person who defaults on a loan is considered a loan defaulter. Penalties for loan defaults are applied according to the type of loan and the specific terms of the contract.

The key difference between secured and unsecured loans lies in their very name. Secured loans are guaranteed by the borrower's property or assets, which protects the lender to a much greater extent. Unsecured loans do not require collateral, so there is more risk for the lender. These risks need to be compensated somehow, so the terms and requirements in unsecured loans are tougher than in secured loans.

A non recourse loan is a secured loan (in which the collateral is most often real estate) which has a very important feature. If the borrower fails to fulfill his obligations under the loan agreement, he is liable to the lender only to the extent of the collateral, even if its value is less than the amount of the borrower's obligations to the lender.

A recourse loan or debt entails personal liability of the borrower. A non-recourse loan does not allow the lender to claim anything other than collateral. For example, if someone fails to repay a non-recourse mortgage loan, athe lender may only foreclose on the real estate that was the collateral.

Predatory lending is the practice of issuing loans with extremely high interest rates. Predatory lending methods include direct deception of borrowers, aggressive sales techniques, taking advantage of borrowers' financial unawareness, confusing contractual terms, and so on. In some countries, predatory lending is illegal.

An unsecure loan is a loan agreement that does not include any collateral on the part of the borrower, against which the lender grants the requested money. Large loans and mortgages are rarely granted without collateral, which can be either property (movable or immovable) or the borrower's assets.