The "transfer fonksiyonu" (transfer function) is a mathematical representation used in control systems and signal processing. It describes the relationship between the input and output of a system in the frequency domain. Typically expressed as a ratio of two polynomials, it helps engineers analyze system behavior, stability, and response characteristics. In control theory, the transfer function is crucial for designing and understanding systems like feedback loops and filters. By examining the transfer function, engineers can predict how a system will react to various inputs, making it an essential tool for system analysis and design.