IQ - Intelligence Quotient
IQ is the parameter or the score which is obtained from several tests and used to measure the intelligence of a person.
The parameters of IQ are different for different people under various conditons. For example the parameters for the student and the person appearing for the IAS exam are different.
For students, IQ is used to check whether student is fit for further education or not.
IQ is also used the measure the knowledge of a person applying for job to check whether he is fit for the job or not.