Any and everything that is exchanged, purchased or consumed is either a good or a service.
Goods are tangible, hard matter. For example, cars, houses, computers, shoes, and apples.
Services are just the opposite. For example, education, entertainment, haircuts, and law enforcement.
The two are closely linked: A chef prepares your meal. The chef's cooking is his/her service. A tasty meal is the good produced. We benefit from the production of the good and the service.
The exchange, purchase, or consumption of goods and services forms the basis of all financial and economic transactions.