This document provides an overview of patents including definitions, requirements for patentability, major patent types and offices. It discusses what can be patented, the need for patents, and major patent offices in India, US and Europe. It also summarizes how patents are obtained for drugs, patent term and extensions, and the Indian Patent Act of 1970. The document was submitted by Asuprita Patel, an M.Pharm student in India, as part of a school assignment on patents.