Hello,
Several receivers, including the AR8000, AR8200, AR8600, Icom R20 etc. (and various Ham Radios also) have the 2 VFO feature. Basically, the 2VFO means that the radio has 2 receivers, which can tune to either 2 frequencies in the same band at the same time, or 2 frequencies in different bands at the same time.
On some of the radios, certain modes (like SSB) may not be available on both VFOs or not both VFOs at the same time. Also some modes may not be available in all frequencies.
Mark