Okay, so when someone wants to become a teacher, they usually need to go to school to learn how to be a teacher. The Professional Graduate Certificate in Education (PGCE) is a special program that helps people to become teachers in a professional way.
Think of it like playing a game. Before you start playing, you need to learn how to play the game properly. The PGCE program teaches people who want to be teachers how to play the "teaching game" the right way.
The program is called "graduate" because you need to have already finished university before you can enroll in it. That means you need to be a "grown-up" who has already gone to school for a while. The program is also called a "certificate" because once you complete it, you get a certificate that shows you are qualified to be a teacher.
During the program, you will learn about different teaching techniques and strategies, how to work with different kinds of students, and how to plan lessons that will help your students learn. It's a lot of hard work, but it will help you become a really good teacher.