When one person transfers ownership of real estate to another, the document that consummates the transfer is a deed. There are a number of different types of deeds, each designed for particular transactions. Probably the two most common deeds in Texas are the warranty deed and the quitclaim deed.
A warranty deed transfers the land and also promises, or warrants, that the transferor has good title to the property. A quitclaim deed, on the other hand, contains no such promise. It merely transfers whatever right, title and interest the transferor has in the property -- which theoretically could be none at all.