Orange juice can be made from fresh juice, concentrated juice, pasteurized juice, pulp options, or fortified juice. Freshly squeezed juice is the most natural and flavorful option, while concentrated juice removes water for easier transportation and longer shelf life. Pasteurized juice is heated to kill harmful microorganisms, ensuring safety and shelf life. Pulp options include no pulp, some pulp, and high pulp. Some juices are fortified with additional nutrients like calcium and vitamin D.