"Each" is a determiner used to refer to individual items in a group, emphasizing their individuality. It is often used to highlight that every single member of a set is being considered separately. For example, in the sentence "Each student received a book," it indicates that every student got their own book, not just one shared among them. In mathematics, "each" can also refer to the concept of distribution. When dividing items or resources, saying "each person gets two apples" means that every individual in the group will receive two apples, ensuring fairness and equal distribution among all involved.