Can someone explain virtue signalling to me?

[Norfolklassie]

Long time lurker of the feminism threads and peaked some time ago. I don’t contribute as I don’t yet feel confident enough, especially with terminology.

Could anyone explain simply to me what is virtue signalling - I think I understand it, as have looked around some websites but I’m unable to make the distinction between when someone is supporting a cause or virtue signalling.

Is there a term for "reverse virtue signalling"?
That's when they proudly announce that they are politically incorrect, though technically they are virtue signalling to the racist misogynist creep demographic.