Give Audit Report for going concern and materiality

The auditors’ report to the shareholders of a public limited company included the following statements: “The accounts have been prepared on a going concern basis and the validity of this depends on the company’s bankers continuing their support by providing adequate overdraft facilities”. “Because of the materiality of the matters referred to in a previous paragraph we are unable to form an opinion as to whether the accounts give a true and fair view of the state of affairs of the company”. Explain the following terms as used in the above statements: (1) Going concern (2) Materiality