What is the difference between confidence and over confidence?

According to me,

Confidence is like that I can do it.

Overconfidence is like that only I can do this no one else.

According to me,

Confidence:it is based on our abilities and strength if we are planned for a particular work with a positive manner then we say yes I can.

Over confidence:it is based on the previous success on a particular work on that success whether he or she commited that they can do in a very relaxed manner it is good to have a look back the previous achievements and success it gives a great strength and positivity in ourselves but it is more important to focus on the present work and should be analysed by your own whether the work can be finished or not based on your work abilities.

Sir, confidence is something that boosts us up in every critical situation that yes I can. And overconfidence is the thing that creates a superiority complex in us that I am above all.

Confidence means I can do that work because I am already prepared.

Over confidence means I can do that work but I need not to be prepared.

According to me confidence is - I can do it by my hard work.

Overconfidence -- I can do it very easily.

Confidence is in the sense: it leads to win.

Over confidence is in the sense:some times it leads to fail.

Believing our strength while doing any work is confidence,

Showing aggressiveness while doing any work is over-confidence.

Confidence.

Believing our strength while doing any work is confidence (success).

Over-confidence.

Showing aggression while doing any work is overconfidence (failure).

Confidence means : Feeling that you are sure about your capability, opinion and work based on your continuous past experiences and work.

Over-confidence means: An individual who thinks they are much smarter than they actually.

Writing exam well and expecting full out of full marks is confidence.

Not writing the exam well and expecting full out of full marks is overconfidence.