The main thing is that tertiary sector is also known as service sector. The difference is that tertiary sector is different from other sectors because it supports the process of production but does not produce goods. Also it covers the many more area which comes under unemployment.

All activities generate employment rather than goods which is the reason that tertiary sector is called service sector and it helps in the development of primary and secondary sector.

For example- Transportation, Storage, Communication, banking etc. are the examples of this sector because instead of producing products it produces employment which helps in the development of other sectors also.