Spectroscopy is a scientific technique that involves the interaction of electromagnetic radiation with matter. It is used to study the chemical and physical properties of matter, and has a wide range of applications in many different fields, including physics, chemistry, astronomy, and engineering. There are several different types of spectroscopy, including absorption spectroscopy, emission spectroscopy, and scattering spectroscopy. Absorption spectroscopy involves the absorption of electromagnetic radiation by a sample, and is used to study the composition of a substance. Emission spectroscopy involves the emission of electromagnetic radiation by a sample, and is used to study the structure and properties of a substance. Scattering spectroscopy involves the scattering of electromagnetic radiation by a sample, and is used to study the size and shape of particles in a sample. By 1884, the word "spectrograph" had entered the scientific lexicon on a global scale. Mass spectrographs are historical spectrometry instruments that record the spectrum of mass values on a photographic plate and measure the mass-charge ratio of ions. Except in cases when the mass spectroscope resembles a mass spectrograph, the ions' beam is diverted to the phosphor screen. Early equipment that required immediate observation of the effects of modifications tended to adopt mass spectroscope design. The photographic plate is placed inside the apparatus and exposed when it has been appropriately set. The term "mass spectroscope" persisted despite indirect oscilloscope measurements taking the place of the direct brightness of the phosphor screen. The phrase "mass spectroscopy" is no longer recommended due to the possibility of misunderstanding with "light spectroscopy." Abbreviations for mass spectrometry include mass-spec and MS. One of the most common types of spectroscopy is infrared spectroscopy, which involves the interaction of infrared radiation with a sample. Infrared spectroscopy is used to study the vibrational, rotational, and other low-frequency modes of a molecule. It is a powerful tool for studying the structure and functional groups of molecules, and is widely used in the fields of chemistry and biology. Another common type of spectroscopy is nuclear magnetic resonance (NMR) spectroscopy, which involves the interaction of radio waves with the nuclei of atoms in a sample. NMR spectroscopy is used to study the structure and dynamics of molecules, and is particularly useful for studying the structure of organic compounds. UV-visible spectroscopy involves the interaction of ultraviolet and visible light with a sample, and is used to study the electronic structure of molecules. It is a powerful tool for studying the absorption and emission of light by molecules, and is widely used in the fields of chemistry and biology. Mass spectrometry is a type of spectroscopy that involves the interaction of a sample with an electric or magnetic field. It is used to study the mass and abundance of molecules, and is particularly useful for analyzing complex mixtures of compounds. Overall, spectroscopy is a powerful and widely-used technique that plays a crucial role in many different fields. It allows scientists and researchers to study the properties and structures of matter, and has led to many important discoveries and advances in fields such as chemistry, physics, astronomy, and engineering.