A representation is a statement of fact (rather than opinion) that is made prior to the making of a contract; it is made by one party to the other party so as to induce that other party to enter into the contract. 

What is the difference between a representation and a warranty? 

A warranty is a statement of similar effect that has already become a term of the contract. Whether a statement is a representation or a warranty depends on the intention of the parties tested objectively. The remedies are different. Namely, a breach of warranty normally gives rise to contractual damages. By contrast, as a result of the operation of s.2(1) of the Misrepresentation Act 1967, the measure of damages for both negligent and fraudulent misrepresentation is assessed on a tortious, rather than contractual, basis.