Physiotherapy involves treating and preventing disease through physical means like exercise, heat, electricity and massage rather than drugs or surgery. Physiotherapists examine patients to diagnose issues, develop treatment plans, and provide independent or team-based care. They are subject to ethical guidelines like respecting patient rights and providing competent services. Electrotherapy is a type of physiotherapy that uses electrical currents, including techniques like TENS, IFT and Russian stimulation to treat patients.