What does IF stand for?

Intake fan

Institutional Fundraising

Insterstitial-Free

Integrating Factor

Is Fusion

Intermediate-Frequency

Interface

The boundary between any two phases. Among the three phases (gas, liquid, and solid), there are five types of interfaces: gas-liquid, gas-solid, liquid-liquid, liquid-solid and solid-solid. A collection of operations that are used to specify a service of a class or a component. alsoclass, port type. 2.A shared boundary between independent systems. An interface can be a hardware component used to link two devices, a convention that supports communication between software systems, or a method for a user to communicate with the operating system, such as a keyboard.