Failure is a state or condition of not meeting a desirable or intended objectives, in other words failure is lack of success.
Why do people fail?
Most people fail because they are yet to realize who they really are, they don't know their internal strength or capability. A lot fail because they don't have a target, they have no goals in life. Sometimes it helps to discover who you really are, where you're coming from and where you're really going, don't get discouraged because you fail, summon up the courage to retry, access you're failure, realize your mistakes, correct them and move on. Remember you have a lot to live for and always try new things.