Plain English Meaning
An instrument approach that uses radio signals to guide an aircraft straight down to Runway 28R, telling the pilot both whether they are lined up with the runway and whether they are at the right height as they descend.
Full Definition
The Instrument Landing System serving Runway 28R at a given airport. ILS 28R refers to the precision approach procedure that guides aircraft to Runway 28R using radio signals that provide both lateral guidance (centerline alignment) and vertical guidance (glide path) down to the runway.
Context Anchor
Seen on approach charts, in avionics procedure lists, and in for an instrument approach.