noise despecle definitions

[Jeffs Chips]

Can someone clarify what do the noise and despecle features do?  There are references in the motioneye configuration percentages or values but nothing that actually explains what noise is, what despecle is.  When I look up the meanings in the provided dictionary, it's just a repeat of what the pop up's provide.

Thanks.

[StarbaseSSD]

When using some cameras, low light / night situations can cause a 'snow' like effect. " Auto Noise Detection " and " Despeckle Filter " help remove the 'static', helping prevent 'false positives' in motion detection. They are either 'off' or 'on'.