Academic mobility means when students or teachers go to different schools or countries to study or work for a while. It's like when you go to your grandma's house for a sleepover or visit a new park with new friends.
Sometimes, students or teachers go to another place to improve their skills or learn something new. They might also teach others what they know. This is important because different schools and countries might have different ways of teaching or doing things. So, when people move between places, they bring new ideas, knowledge, and experiences with them.
This helps everyone to learn and grow. Just like when you share your toys with your friends, they also learn something new and get to have fun playing with different toys. So, academic mobility is like sharing knowledge and gaining new experiences.