Two minutes short conversation between Father and Son regarding Carrier.
Father- Oh, look our train has arrived.
Son- Yes, father!
Father- Where is our carrier ?
Son- He is over there.
Father- Yes, now I see him.
Son- Father ! How heavy the load must be for him?
Father- It is heavy for him but he must be used to it.
Son- What are these carriers? How many types are these?
Father- Carriers are people whose job is to carry objects or people. The job is same, they just carry different things. There is a newspaper carrier who carries newspaper. If the job is to carry household items or people, your business is as a common carrier such as a moving company or an airline.
Son- Oh, now I understood. There are many carriers but the job type is same.