Bipolar devices are electronic components that use both positive and negative charge carriers to operate. They are commonly found in transistors, such as Bipolar Junction Transistors (BJTs), which amplify electrical signals. These devices are essential in various applications, including audio equipment, radio frequency amplifiers, and digital circuits. The key feature of bipolar devices is their ability to control current flow through the interaction of electrons and holes. This allows for efficient signal processing and amplification. In contrast to Field Effect Transistors (FETs), which rely on electric fields, bipolar devices are current-controlled, making them suitable for specific electronic functions.