The term "whether" is a conjunction used to introduce alternatives or choices. It often appears in sentences that present two possibilities, such as "I don't know whether to go to the party or stay home." In this context, "whether" helps clarify the options being considered. In addition to its use in choices, "whether" can also indicate uncertainty. For example, in the sentence "I am unsure whether it will rain tomorrow," it expresses doubt about the outcome. This makes "whether" a useful word in both decision-making and expressing indecision.