What is the difference between confidence and over confidence?

There is a very thin line difference between confidence and overconfidence.

When a person has confidence he/she says like yes, I can do anything for this.
But when he/she says like I only can do this, is a showcase of overconfidence.

Which is not good because everyone should keep their confidence in themselves, not on others.

Confidence means I'm suitable for your job.

Overconfidence means only I'm the person suitable for this job.

Confidence means capabilities to do something good or you can see something good in every condition. And believed on ourself.

But overconfidence means you think that only I can do that work nobody can do it better than me. Or we can say a person who doesn't have proper knowledge still he/ she think that they are best and no one can replace them. It is only a sign of overconfidence so we should avoid this type of thinking and thought process instead of it we can say that yes we have knowledge but we also have to improve it day by day to enhance our skills and ability or should appreciate others also to achieve well in their life never underestimate yourself as well as others.

That's all I think.

Thank you.

Confidence means I can do it at my best level.

Overconfidence means only I can do it at my best level.

I can do this task is confidence.

Only I can do this task is overconfidence.

I can do it. Is a confidence.

Only I can do it is overconfidence.

According to me;

Confidence is the meaningful key to life.

Overconfidence is the meaningless key of life.

I can do this task is confidence.

No, I can do this task other than me is overconfidence.

CONFIDENCE: It is a reality. He wants to improve him and to be perfect.

OVERCONFIDENCE: It is an illusion. He thought that he is improved one.

I can solve that problem means you are Confident.

Only I can solve that problem means you are Over-Confident.