A name is something that people call you by. It helps to differentiate you from other people. "Cal" is a name that some people have. It might be short for another name like "Calvin" or it could be a name by itself. People with the name "Cal" might be boys or girls. When someone says "Cal," they are referring to a specific person. It's like if you had a toy car and you called it "Red Car" to tell it apart from your other toys. So, "Cal" is just a special way to call someone.