A deed is a written document that transfers title of property from one or more grantors to one or more grantees, and a warranty deed is one type. Joint tenancy is a particular way for more than one person to hold title in property, as opposed to tenancy in common.
What differentiates a warranty deed from others, such as a quit claim deed, is that the grantor warrants or guarantees to the grantee that he holds a good title to the property being conveyed, and that the title can be transferred.
The difference between joint tenants and tenants in common is known as the right of survivorship. When one joint tenant dies, the title automatically transfers to the surviving tenants immediately.