What is flickering in cathode ray oscilloscope?

Flickering in a cathode ray oscilloscope (CRO) refers to the unstable display of the waveform on the screen, which can occur due to various factors such as insufficient triggering, improper time base settings, or noise in the input signal. This instability can make it difficult to accurately observe and analyze the waveform. Adjusting the triggering settings or improving signal quality can often reduce or eliminate flickering, resulting in a stable and clear display.