UTF-8 is a type of coding system that computers use to store and share information. It stands for "Universal Character Set Transformation Format-8 bit" and it's used to store text in computers. Computers store information using numbers. The numbers might be 0-255 which looks different from numbers like 1, 2, 3 - it's like a secret code. When information is stored in computers using UTF-8, the computer knows how to understand it and share it with other computers! UTF-8 helps computers understand when people are sharing information such as words or letters, so that everyone around the world can understand each other.