Asynchrony in computer programming is like playing with a buddy. When you want to play together, you call your friend and ask if they are ready to play. If they are, you both go and have fun. But sometimes, your buddy is busy doing something else. They might need to finish their lunch or finish their homework. In this case, you don't want to wait for them to be ready because you could be doing something else in the meantime, so you tell them to let you know when they are ready to play.
This is like asynchrony in computer programming. When two programs need to communicate with each other, sometimes one program needs to finish something else before it can work with the other program. Instead of waiting for the first program to finish, the second program can go and work on something else in the meantime. When the first program is done, it will let the second program know that it is ready to work together. This way, both programs can work efficiently without wasting time waiting for each other.
In summary, asynchrony in computer programming means that two programs can work on different tasks at the same time without waiting for each other. They communicate with each other to let each other know when they are ready to work together.