A more thorough explanation:

A normal school is a type of training school that prepares people to become teachers in public schools. These schools first appeared in the United States in the 1800s and were originally two-year programs for elementary school teachers. Over time, they expanded into four-year colleges that offered a wider variety of education and teaching programs.

For example, if someone wants to become an elementary school teacher, they might attend a normal school to learn how to teach young children. They would take classes in subjects like math, science, and English, as well as classes on how to teach these subjects to children. After completing their training, they would be ready to start teaching in a public school.

Normal schools are important because they help ensure that teachers have the knowledge and skills they need to educate students effectively. By attending a normal school, teachers can learn how to create lesson plans, manage a classroom, and work with students of different ages and abilities.