What is probability?

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Definition of probability: 

                                               Probability is the the chance of occurrence of an event in the present or in future.When we  talk about the probability of  an event we basically mean the chance of the even.
For example:
                     when we want to know about the weather of our city.We are saying that  will it be sunny day or rainy day tomorrow.We are talking about the chance of rainy and sunny day.The chance of rainy or sunny is  50 50 .It may be possible that tomorrow will be a rainy day but it may be sunny.we can not say that it will be sunny.Because we do not know the exact condition.
Another example:
                           In the tossing of a cricket match.The probability of appearing of head or tail is 50 50.
Both the team captains have a equal chance to win the toss. 

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