The term "either" is a conjunction used to present a choice between two options. It helps to indicate that one of the two possibilities must be selected. For example, in the sentence "You can either have tea or coffee," it shows that the person must choose one of the two beverages. In addition to its use as a conjunction, "either" can also function as a pronoun or adjective. For instance, in the phrase "Either option is acceptable," it emphasizes that both choices are valid. This versatility makes "either" a useful word in everyday language and decision-making.