In-system programming

In-system programming is when we change the way something works by talking to it through a special connection. It's like when you use a remote control to change the TV channel. Instead of a remote control, in-system programming uses a special wire that connects to the electronic device we want to change. Once we are connected, we can tell the device what we want it to do and how we want it to behave. This is very helpful because sometimes we need to update the software that runs the electronic device, or we might need to fix a problem with it. With in-system programming, we can make changes to the device without taking it apart or using a different tool. It's like giving the device a brain transplant without hurting it!