A service mark is a symbol or word used by businesses to show that they offer services to people. It's like a special name that sets a business apart from other businesses that do similar things. For example, McDonald's has a service mark for their famous golden arches logo. When you see the golden arches, you know that you can go there for fast food like burgers and fries.
Service marks help businesses protect their brand by making sure that other people don't use their name or logo to trick customers into thinking they are the same business. It's like a secret code that only the real business knows, and it helps you know that you're getting the real deal when you use a company's services.
Just like how the teacher has a name tag that says "Teacher" so you know who is in charge of the classroom, a business can use a service mark to show what services they offer and who is in charge of providing those services.