In the US, kindergarten is the year of school children attend before entering the first grade. Often kindergarten only lasts half a day or about three hours (as opposed to the other grades, which have classes all day). Children usually are five years old when they start kindergarten. The teacher is called a "teacher" and must have a degree and be certified just like any other school teacher. (Sometimes K teachers need specialized training, as they'll be working with very young children, which takes more patience and a different type of psychology.) Kindergartners mainly learn basic socialization skills, like how to play nicely with one another, how to share, how to sit still and listen to the teacher, etc. They also learn any basic life skills they haven't quite mastered yet, such as tying their shoes, buttoning buttons, etc. And some very rudimentary educational things are taught as well, such as the alphabet, the colors, numbers, their left from their right, things like that.