What does I/Q data stand for?

I/Q data stands for in-phase and quadrature data. I/Q data is used to represent sinusoidal signals in the form of two components: the in-phase component and the quadrature component. The in-phase component represents the cosine of the signal, while the quadrature component represents the sine of the signal. This data can be used in a variety of applications, including radio frequency systems.