Overconfidence (or hubris?) and Cognitive Bias

Wanted to write about overconfidence today, but got confused about whether it is about "overconfidence" or "hubris" that I wanted to write about.

People use overconfidence in many erroneous ways. Whatever it may be, overconfidence is a "cognitive bias" type that manifests itself in various ways.

So, Wikipedia says, "...A cognitive bias is a pattern of deviation in judgment, whereby inferences of other people and situations may be drawn in an illogical fashion..."

For more information, see Cognitive Bias.