Purpose

They cytoplasm is everything in the cell that is not an organelle.

Function

This contains many of the protiens, molecules, and important substances that the cell needs, as well as keeping the organelles seperate. It is similar to air for us; it has many essential ingredients for continued existence; it provides a medium in which the organelles can exist (living in a vacum is not very easy), and pretty much fills up space.

Location

Inside the cell wall and cell membrane, around the all the organelles.