The lightsaber, sometimes referred to as a laser sword, is a weapon used by the Jedi, the Sith, and other Force-sensitives. Lightsabers consist of a plasma blade, powered by a kyber crystal, that is emitted from a usually metal hilt and can be shut off at will.
An article (abbreviated ART) is a word (or prefix or suffix) that is used with a noun to indicate the type of reference being made by the noun.
Parts of Speech Chapter 9 - Articles. An article is a kind of adjective which is always used with and gives some information about a noun. There are only two articles a and the, but they are used very often and are important for using English accurately.