A victor airway is a standard route for aircraft traffic, generally between two VORs or VOR intersections.
Victor airways include the airspace 4 miles on each side. The airways are based on the radials of VORs. The airways are available for IFR or VFR traffic from 1,200 AGL to 18,000 MSL. The airways are useful for ATC to separate IFR traffic, in particular in places without radar coverage as the aircraft can be separated by altitude and/or time. On a VFR sectional, victor airways are depicted at a blue line and numbered starting with a “V”, such as V280.
AIM 2018 5-3-4. Airways and Route Systems