A focal plane array (FPA) is a two-dimensional grid of light-sensitive detectors that are used in digital imaging devices such as cameras and sensors. FPAs are commonly used in applications such as digital cameras, night vision devices, and thermal imaging cameras. FPAs are typically composed of a large number of individual detector elements arranged in rows and columns. Each detector element, or pixel, is capable of converting incoming light into an electrical signal, which can then be processed and displayed as an image. FPAs offer several advantages over traditional imaging technologies, including high sensitivity, fast response times, and the ability to capture images in real-time. They are also able to capture images over a wide range of wavelengths, making them suitable for a variety of applications in scientific research, medical imaging, and remote sensing. Overall, focal plane arrays play a crucial role in modern imaging systems, enabling the capture of high-quality images in a wide range of environments and applications.