The phrase "will go" is used to indicate a future action or event. It combines the modal verb "will" with the base form of the verb "go." This construction is commonly used in English to express intentions, plans, or predictions about what someone or something will do in the future. For example, if someone says, "I will go to the store," it means they plan to visit the store at a later time. Similarly, "They will go on vacation" suggests that a group of people has plans to travel for leisure in the future.