A demand letter, or LOD, i.e. a Letter Of Demand (of payment), is letter stating a legal claim (usually drafted by a lawyer) which makes a demand for restitution or performance of some obligation, owing to the recipients' alleged breach of contract, or for a legal wrong. Although demand letters are not legally required the are frequently used, especially in contract law, tort law, and commercial law cases. For example, if one anticipate a breach, it is advantageous to send a demand letter asserting that the other side appears to be in breach and requesting assurances of performances. Demand letters that are not responded to may constitute admissions by silence. Also, a demand letter will often generate a denial letter stating the basis for rejecting your side's claim, and is sometimes a good indication of what defenses will be raised if suit is brought later.