Multi-usage instrument that measure voltage (voltmeter), current (ammeter), resistance (ohmmeter) and other quantities.
Uses an analog-to-digital converter to convert the analog signal level into a digital result.
Results displayed on a numerical display.
The EDU34450A left is a “5 ½ digit display”. This means the instrument can display 5 full digits (0-9) and the most significant digit can only be a 1 or 0
I think of an oscilloscope as a DMM that digitally samples the signal as a function of time and plots it on a display.
A wide range of sample rates and time ranges (time bases) can be accommodated.
Multiple channels can be sample and plotted at once.
Significant post-processing capabilities exist in modern scopes.