Multicellular organisms have division of labour. Explain

The body of a multicellular organism has cell as a basic structural unit. The cells are organised to form tissues such as blood, bone, etc. The tissues are organised to form organs such as heart, kidney, etc. The organs are then organised to form organ systems such as digestive system, reproductive system respiratory system, etc. The various organ systems of organism get arranged to form a complete individual.

How can a division of labour occur among cells ? Please explain it ?