A lightsaber is a sword-like weapon that emits a blade of plasma from its hilt. The Jedi and Sith use them in combat, and they are able to cut through almost anything - including the Mandalorian armor known as beskar. However, there is some debate as to whether or not a lightsaber can actually cut through beskar. While it is true that beskar is extremely tough, it has been shown to be vulnerable to certain forms of energy. For example, in the Star Wars: Clone Wars TV series, Anakin Skywalker was able to melt beskar with his lightsaber by using the Force to channel additional energy into his blade. As a result, it seems likely that a lightsaber could cut through beskar if the user was able to channel enough energy into their blade.