Optical filters are devices that selectively transmit or block specific wavelengths of light. They are commonly used in photography, scientific research, and optical instruments to enhance image quality or isolate certain colors. By allowing only certain wavelengths to pass through, optical filters can improve contrast and reduce unwanted glare. There are various types of optical filters, including bandpass filters, low-pass filters, and high-pass filters. Each type serves a different purpose, such as allowing a specific range of wavelengths while blocking others. These filters are essential in applications like spectroscopy and laser technology, where precise control of light is crucial.