Hello dear,
.

• Internal auditors are independent, objective assurance and consulting activity designed to improve organisation.
• External auditors should with specific with laws and rules for financial statements of organisations.

.

• Internal auditors examine issues related to company business practices and Risk's.
• External auditors examine the financial records and issues/opinions regarding financial statements.

.

• Internal Audits are conducted throughout the year
• external Audits are conducted a single annual audit

.

• internal audits are company employees
• External Audits work for outside Audits

.

• Internal auditors are hired by company
• external Audits are hired by share holders

.
In simple internal auditors are working for building company reputations and external auditors work to maintain a company reputation without having any external problems of financial issues.
.
hope I was relevant and cleared your question.
thank you