When you have a contract, you expect that all the terms of the contractor are spelled out and there’s no separate oral agreements. You certainly don’t want any party to claim that someone said there were some other terms that were agreed to, perhaps claiming it was orally or by some other writing of some sort. An integration clause, sometimes referred to as a merger clause, eliminates this confusion. Stating that any other statements or representations are integrated or merged into the written agreement and that no party may rely on any other statement or representation that was made before the agreement, and they may, may not rely on that to change or alter the terms of the agreement. An integration or merger clause might say this agreement is the complete and final agreement of the parties, and no representations other than those contained in this agreement shall survive or be deemed valid. Talk to a very experienced trial lawyer to best understand the right option for you.