Jitter can be used to add some randomness to any kind of selection, which can be helpful when you are creating natural (caves) or distorted (CAVES IN HELL!!!) environments.
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This function can be applied to any kind of selection from both Classic and Visual modes.
Depending on selection type, different sets of settings can be used:
When vertices or linedefs are selected in Vertices or Linedefs mode, or only walls are selected in Visual mode, you'll get this:
When sectors are selected in Sectors mode, or floors/ceilings are selected in Visual mode, you'll get this:
When things are selected in Things or Visual mode, you'll get this:
You can use 
button to update random values for a given property.
If you enable the Relative option, the property value will be calculated as a percentage of a maximum possible value.