Self-confidence, an integral part of human nature is the combination of self-esteem and self-efficacy. It is the internal sense of humans that boosts their nature in all ways and lets them believe in their own capabilities. Someone who lacks self confidence strives hard to achieve their goals and tends to have negative results in life.
The difference between a person with low confidence and high levels of confidence can be seen in the behaviour and personality of a person and the way he interacts with others. A person who is confident is always strong on what he speaks but a person who lacks self confidence will have flaws in his speech.