Salvatorious clause is normally known as severability clause. When a contract is divided into several parts it includes a salvatorious clause. Salvatorious clause is essential in a contract with several parts because even if some clauses of the contract become ineffective the remaining clauses of the contract will not be affected because of the presence of salvatorious clause.
Salvatorious clause helps to retain the nature of a contract. Even if a clause or term in a contract is invalid or against law, the rest of the contract which is valid can be saved if a salvatorious clause is present. The rest of the contract can be fulfilled. The clause that is not valid can be rewritten to fit the original intent of the contract according to the requirements of law. Such clauses are sometimes used in statutes to preserve the effectiveness of certain portions of the statute if some part is struck down as unconstitutional by a court exercising in judicial review.