1. The phrase "each one" is used to refer to individual items or people in a group, emphasizing them individually. 2. The phrase "each one" implies looking at or considering every individual element separately. 3. For example, "Each one of these apples is fresh" means considering every apple individually. 4. It is commonly used in contexts where you want to stress that the statement applies to all members individually, rather than collectively. 5. Use "each one" when you want to be clear about individuality rather than a group as a whole.