Is it true that the cytoplasm is the fluid that fills the cell?

The given statement is true.

The cytoplasm is the gel-like substance that fills the cell and surrounds the organelles. The cytoplasm is a gelatinous liquid composed of water, salts, and various organic molecules. Some intracellular organelles, such as the nucleus and mitochondria, are enclosed by membranes that separate them from the cytoplasm.