Programmable & Variable Gain Amplifiers (VGAs) are not a specific brand but a category of electronic components used in various industries. These amplifiers are produced by several companies worldwide, including Analog Devices (USA), Texas Instruments (USA), and STMicroelectronics (Switzerland/France). They serve industries such as telecommunications, medical equipment, and industrial automation, providing adjustable signal amplification for precise control. Key products include digitally programmable amplifiers, analog VGAs, and integrated RF amplifiers, often found on platforms like Radwell and Grainger.