Telemedicine is defined as using telecommunications to provide healthcare remotely by sharing medical information and expertise over distances. It involves transferring various medical data like images, sounds, and patient records via internet, intranet, computers, and telephone lines. Some key applications of telemedicine include teleconsultation, telemonitoring of patients, telediagnosis, and tele-education of medical practitioners. While telemedicine provides benefits like improved access to care and cost savings, its adoption faces challenges due to issues around technology infrastructure, licensing, and patient acceptance of remote healthcare.