Which of the following is an advantage of an oscilloscope versus a digital voltmeter?
Why An oscilloscope plots voltage against time, so it shows the actual shape of a signal: rise and fall times, ringing, distortion, modulation envelopes, pulse widths and phase relationships. A digital voltmeter collapses all that into a single number, typically a DC level or an RMS/average value of an AC waveform. That makes the scope the right tool whenever you need to see what a complex, non-sinusoidal waveform is actually doing.
Watch out Greater precision is tempting, but a good DVM is usually far more accurate for a simple voltage reading; a scope's amplitude accuracy is typically only a few percent. Impedance measurement needs an impedance bridge or antenna analyzer, not a scope alone.
Scope shows the picture, meter shows the number. Waveform shape = oscilloscope.