Audit services refer to an independent examination of a company's financial statements and records, performed by a qualified external auditor. The purpose of an audit is to provide an objective opinion on whether the financial statements of a company provide a true and fair view of its financial performance and position.

Audits are typically required for larger companies as well as for certain other regulated entities such as some charities. Smaller businesses may choose to have an audit, as a way of providing additional assurance to stakeholders, such as investors, creditors and lenders, that the accounts show a true and fair view. 

Overall, audit services can provide valuable assurance that a company's financial statements are accurate and reliable. They can also help to identify areas for improvement in accounting systems, financial reporting and controls, which can improve a business's exposure to fraud and error and lead to improved financial performance.