What is glitch in 2 to 1 mux?

A glitch in a 2-to-1 multiplexer (mux) occurs when there are brief, unintended changes in the output due to the propagation delay differences between the signal paths. This can happen when the select line changes state, causing both input signals to momentarily influence the output before settling. Consequently, the output may exhibit rapid fluctuations, which can lead to errors in digital circuits if not properly managed. Glitches can be mitigated using techniques like synchronization or adding delay elements.