What is the difference between confidence and over confidence?

There's a very thin line of difference in between confidence and overconfidence. Well, I can explain to you the whole fact with a simple example.

Right before coming to this interview, I was thinking that hopefully, I'll be impressive enough to the HR, through my answers while the Q&A session and I'll surely be capable enough to fulfil the criteria of this job role. So this is called confidence, which is quite good but you know what over-confidence is, if I think that all the other candidates, sitting outside the room will not be able to fulfil the criteria of this job role and will none of em' be selected for the next round. Whereas confidence rejuvenates your soul, recharge your mind and body, over-confidence is a very toxic material by itself. So, we should through overconfidence out of the window but must keep confidence within our heart. Thanks.

Confidence is "I can do this".

Over confidence is "only I can do this".

Confidence means I achieve my goal in my life.

Over-confidence means I'm 100 per cent better than other persons.

Confidence is in the sense: it leads to win.

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

Confidence: I will surely have a job.

Over-confidence: I will get a job in your company. As there are peoples who might be better than me.

Confidence shows knowledge.

Overconfidence shows fake attitude.

Confidence: I will do best performance in interview and try to impressive HR.

Over confidence: I will definitely do best performance in interview and definitely impressive HR.

Confidence is being aware of one's potential and worth.

While, Over Confidence is being unaware of others potential and worth.

Confidence is when you can accurately estimate your potential.
Overconfidence is when you overestimate your potential.

Confidence is self-encouraging whereas overconfidence is destroying one own-potential.