The cytoplasm is the jelly-like substance that fills the cell and is enclosed by the cell membrane. It is made up of water, proteins, carbohydrates, lipids, and other molecules. The cytoplasm is the site of many cellular activities, including:

- Metabolism: The cytoplasm is where most of the cell's metabolic reactions take place. These reactions include glycolysis, the citric acid cycle, and photosynthesis.

- Protein synthesis: The cytoplasm is where ribosomes, the organelles responsible for protein synthesis, are located. Ribosomes read the genetic code in messenger RNA (mRNA) and assemble amino acids into proteins.

- Transport: The cytoplasm is responsible for transporting materials within the cell. This includes the transport of nutrients from the cell membrane to the organelles, and the transport of waste products from the organelles to the cell membrane.

- Storage: The cytoplasm is used to store various materials, including water, carbohydrates, and lipids. These materials are used by the cell for energy production and other cellular activities.

- Cell division: The cytoplasm is involved in cell division. During cell division, the cytoplasm is divided into two equal parts, each of which will become a new cell.

The cytoplasm is an essential component of the cell. It provides the environment for cellular activities and plays a vital role in the cell's survival.