A BPEL script is like a set of instructions for a computer to follow. It tells the computer what to do and when to do it.
Imagine you are building a tower out of blocks. You start by laying a foundation, then adding more blocks on top of it until the tower is complete. A BPEL script does something similar, but instead it tells the computer which applications to use and how to interact with them.
For example, let's say you need to book a flight for a vacation. The BPEL script would tell the computer to open up a travel website, enter your information, select flights, and book the tickets.
Overall, a BPEL script is a way for computers to communicate with each other and complete tasks automatically. It's like a recipe for the computer to follow step-by-step.