Property Specification Language (PSL) is a way for computer scientists to tell computers what to do using certain instructions. It's like giving instructions to a robot: you give them a set of instructions and they will follow them. PSL is like a robot that reads instructions from a computer language and then follows them.
PSL is a special language that computers understand and use to do things like sorting data and running programs. It's like giving a to-do list to a robot in a special language that it understands. PSL gives instructions in a way that the computer can understand and follow. In other words, it helps computers to do their jobs better and faster.