Audit:

The audit is the process of checking the financial statements of a company `to ensure that it is 100% authentic and free from any kind of bias or fraud.

Fraud:

Fraud means the willingly wrong representation of something, to hide some material facts from outsiders or mislead them about some facts.

Matching concept:

A matching principle is the accounting concept, under this concept expenses, are recorded in the income statement when they help to earns revenue in the same period.

This principle helps the organization to present an accurate picture of the operations.

Expense:

Expense is defined as the cost incurred to acquire something or to earn revenue; it is expired during the accounting period.

Example: Cash paid for salaries, rent, and depreciation.