Definition of Audit:
A timely process or system, inspection to ensure that specifications conform to documented quality standards. An audit also brings out discrepencies between the documented standards and the standards followed and also might show how well or how badly the documented standards support the processes currently followed.
Corrective, preventive and improvement actions should be undertaken to mitigate the gap(s) between what is said (documented), what is done and what is required to comply with the appropriate quality standard. Audit is not only be used in accounting or something that relates to mathematics but also used in information technology.