The full tang blade means that the blade will completely fill the surface of the handle. This type of tang is also called integral type tang. We could also call the full tang a monobloc knife. This is because even without a handle, you will be able to handle it like any other knife (even though the handle still provides better grip and more comfort and safety). If a sword isn't a full tang sword then it isn't suitable for swinging around even casually. It is ok as a show piece. But it is not ok to swing.

Full tang swords are weightier than partial tang knives since the entire sword is made of 1060 high carbon steel or 1095 high carbon steel. The knife is therefore more balanced, which also makes it easier to chop for extended periods of time. Because a full tang knife has a heavier handle, you don't have to exert as much force to cut through hard thing.