What is the difference between confidence and over confidence?

What is the difference between confidence and overconfidence?

Confidence :

Confidence is a good understanding of our strengths.

Overconfidence:

Overconfidence is misunderstandings/misjudgment about our strengths/capabilities.

SNO	HR Interview Question and Answers
01	Tell me about yourself
02	Why should I hire you?
03	What are your strengths and weaknesses?
04	Why do you want to work at our company?
05	What motivates you to do a good job?
06	What are your goals?
07	Are you willing to relocate or travel?
08	Can you work under pressure?
09	How do you feel about working nights and weekends?
10	What is the difference between hard work and smart work?

What is the difference between confidence and overconfidence?