"Probably" is an adverb used to express a likelihood or probability that something will happen or is true. It indicates that while something is not certain, it is more likely than not. For example, if someone says, "It will probably rain tomorrow," they believe there is a good chance of rain, but it is not guaranteed. In everyday conversation, "probably" helps convey uncertainty in decision-making or predictions. It allows people to express their thoughts without committing to a definitive answer. This word is commonly used in various contexts, from casual discussions to more formal situations, making it a versatile part of language.