This document provides an overview of cephalosporins, a class of beta-lactam antibiotics. It discusses the history of cephalosporins, noting they were first isolated from fungus. It describes the mechanisms of action of cephalosporins in inhibiting bacterial cell wall synthesis. The document also classifies cephalosporins into five generations with varying spectra of activity and lists examples of first to fifth generation cephalosporins along with their pharmacokinetic properties and clinical uses.