Quit Claim Deed
/A deed is the legal document that transfers ownership of real property. A Quit Claim Deed conveys ownership and nothing else. The person conveying (the seller) makes no promises of any sort concerning the conveyor's actual ownership or right to possession. If you've ever purchased the Brooklyn Bridge, it was likely by Quit Claim Deed. Contrast with Statutory Warranty Deed.
In WA, technically there are three types of deeds, all defined by statute: the Quit Claim Deed, the Warranty Deed, and the Bargain and Sale Deed. Under this third type of deed, the grantor (the person conveying ownership) only promises good title during the period of grantor's ownership. A defect that predated grantor's ownership is the grantee's problem.