A product-service system is when a company sells not only a physical product, but also includes some kind of service or set of services with it. It's like when you buy a toy and the store also helps you set it up and shows you how to play with it.
Imagine going to a toy store and picking out a toy. With a product-service system, the store would not only sell you the toy but also provide additional services to make sure you have a great experience with the toy. This might include showing you how to use it, troubleshooting any problems you might have, and providing ongoing support.
For example, let's say you buy a toy car. With a product-service system, the store might also offer a warranty to fix any problems with the car if it breaks down. They might also provide replacement parts if something goes wrong. Additionally, the store might offer ongoing maintenance to keep your car running well, like providing oil changes.
Overall, a product-service system is a way for companies to provide comprehensive support for their products, making sure customers are happy and satisfied with their purchase.