epithelial tissue is classified based on cell shape (squamous, cuboidal, columnar etc as mentioned already) and also by cell arrangement. The cell arrangements are simple (one layer), psuedostratified (one layer, but the cells are different lengths so it looks as if there are multiple layers) and stratified (multiple layers). So you could have simple squamous epithelium, or pseudostratified columnar epithilium etc. You can also get transitional epithelium which lines the bladder, ureters and part of the urethra, and glandual epithelium, which as the name suggests, form glands
Squamous Epithelium...forms the lining of cavities such as the mouth, blood vessels, heart and lungs and make up the outer layers of the skin.
Cuboidal Epithelium...found in glands and in the lining of the kidney tubules as well as in the ducts of the glands.
Columnar Epithelium...forms the lining of the stomach and intestines.
Ciliated Columnar Epithelium...found in air passages like the nose...It is also found in the uterus and Fallopian tubes of females.
sorry, spelling error. It should say glandular, not glandual