Different epithelial tissues vary by shape and the number of cell layers. Their structure suits their job - thin layers for absorption, thick layers for protection.

Types Based on Shape and Layers

1. Simple epithelium: Single layer for absorption or secretion like lining of intestine.

2. Stratified epithelium: Many layers for protection like skin.

3. Shapes:

• Squamous: Flat cells.
• Cuboidal: Cube-shaped cells.‍
• Columnar: Tall, pillar-like cells.