A more thorough explanation:

Form 10-K is a report that public companies file with the Securities and Exchange Commission (SEC) to disclose important information about their business operations for the past fiscal year. This report provides a comprehensive overview of the company's condition and includes audited financial statements.

Form 10-K consists of four parts:

• Part 1: Provides a summary of the company's operations, risk factors, significant properties, and legal proceedings.
• Part 2: Provides a summary of the company's stock performance, financial data, management's discussion and analysis (MD&A), market risks, audited financial statements, and internal controls and procedures.
• Part 3: Provides information about the company's directors, executive officers, corporate governance, executive compensation, beneficial ownership of stock by management, and certain relationships and transactions.
• Part 4: Includes the financial statement schedule signatures and allows the company to include any material exhibits.

Apple Inc. filed its 2021 Form 10-K with the SEC, which provides a good example of what a Form 10-K looks like. In Part 1, Apple summarizes its business operations, including its products and services, and identifies its risk factors, such as competition and supply chain disruptions. In Part 2, Apple provides financial data, including its revenue and net income, and discusses its MD&A, which analyzes its financial condition and results of operations. In Part 3, Apple discloses information about its directors and executive officers, including their compensation and beneficial ownership of stock. In Part 4, Apple includes its financial statement schedule signatures and exhibits, such as its code of conduct and corporate governance guidelines.

This example illustrates how a Form 10-K provides important information about a company's operations, financial condition, and governance, which can help investors make informed decisions about whether to invest in the company's stock.