What is the main component of the cell wall of fungi?

The cell wall of fungi is primarily composed of chitin, a nitrogen-containing polysaccharide made up of repeating units of N-acetylglucosamine. Chitin is a tough, flexible material that provides structural support and protection to fungal cells. It is also found in the exoskeletons of arthropods and other invertebrates. 

Cellulose is the main component of the cell wall in plants, a hemicellulose is a group of diverse polysaccharides found in plant cell walls, and pectin is a component of the middle lamella that helps hold plant cells together.