Function
Inside the cell there is a large fluid-filled space called the cytoplasm, sometimes called the cytosol. Cytoplasm was first discovered in 1835 by In prokaryotes, this space is relatively free of organelles and other materials. In eukaryotic cells, the cytosol is where all the organelles are found, like we are all surrounded by air, the organelles are surrounded by the cytoplasm. It is also the home of the cytoskeleton, the back bone of the cell. The nucleus often flows with the cytoplasm changing its shape as it moves. The cytoplasm also contains many salts and is an excellent conductor of electricity, creating the perfect environment for the mechanics of the cell. The function of the cytoplasm, and the organelles which reside in it, are critical for a cell's survival.
Structure
The cytoplasm really has no structure to it. It is simply a liquid that everything floats around in and allows chemical reaction necessary for the life of the cell to take place.