Circuit design is a subfield of electrical engineering that focuses on creating electronic circuits that perform specific functions. This involves designing and implementing circuits using components such as transistors, resistors, capacitors, and inductors to achieve desired functionality. Circuit designers must consider factors such as power consumption, noise, signal integrity, and cost when designing circuits. They use tools such as computer-aided design (CAD) software to simulate and optimize circuits before manufacturing them. Overall, circuit design is a crucial aspect of electronics engineering, as it is essential for the development of various electronic devices and systems, ranging from simple consumer electronics to complex computer systems.