Cephalosporin is a class of antibiotics used to treat a variety of bacterial infections. They work by disrupting the formation of the bacterial cell wall, which ultimately leads to the death of the bacteria. Cephalosporins are often prescribed for infections such as pneumonia, skin infections, and urinary tract infections. This class of antibiotics is divided into generations, with each generation having a broader spectrum of activity against different types of bacteria. The first generation is effective against gram-positive bacteria, while later generations target a wider range of gram-negative bacteria. Common examples include cephalexin and ceftriaxone.