An audit is a systematic and independent examination of books, accounts, statutory records, documents and vouchers of an organization to ascertain how far the financial statements as well as non-financial disclosures present a true and fair view of the concern. It also attempts to ensure that the books of accounts are properly maintained by the concern as required by law. Auditing has become such a ubiquitous phenomenon in the corporate and the public sector that academics started identifying an "Audit Society". The auditor perceives and recognises the propositions before him/her for examination, obtains evidence, evaluates the same and formulates an opinion on the basis of his judgement which is communicated through his audit report.
Any subject matter may be audited. Audits provide third party assurance to various stakeholders that the subject matter is free frommaterial misstatement. The term is most frequently applied to audits of the financial information relating to a legal person. Other areas which are commonly audited include: secretarial & compliance audit, internal controls, quality management, project management, water management, and energy conservation.
As a result of an audit, stakeholders may effectively evaluate and improve the effectiveness of risk management, control, and the governance process over the subject matter.
The word audit is derived from a Latin word "audire" which means "to hear". During the medieval times when manual book-keeping was prevalent, auditors in Britain used to hear the accounts read out for them and checked that the organisation's personnel were not negligent or fraudulent.
Deloitte member firms offer services in the following functions, with country-specific variations on their legal implementation (i. e., all operating within a single company or through separate legal entities operating as subsidiaries of an umbrella legal entity for the country). The 2015 revenue shares are listed in parentheses.