This document provides an overview of Raman spectroscopy. It discusses the principle behind Raman spectroscopy, which involves scattering of monochromatic light when it interacts with a sample. It describes the typical instrumentation used, including lasers as the light source and spectrometers to analyze the scattered light. The key differences between Raman and IR spectroscopy are outlined. Various types of Raman techniques and applications are also summarized, such as its use in analyzing inorganic, organic and biological samples.