A service is when someone does something helpful for another person! When a doctor checks your heartbeat, that is a service. When a teacher helps you learn to read, that is a service too. A barber who cuts your hair and a bus driver who takes you to school are both giving you a service. Services are not things you can hold in your hand, but they are very important!
Many people in your community have jobs where they provide services. A mail carrier brings letters right to your house, and a librarian helps you find the perfect book to read. A dentist cleans your teeth to keep them healthy and strong. People pay for services with money, just like they pay for goods. Services make our lives easier, safer, and a whole lot better!