describe() is used to group related tests together. It creates a test suite and helps organize tests logically:

describe('Calculator', () => {
  test('should add two numbers', () => {
    expect(add(2, 3)).toBe(5);
  });
  
  test('should subtract two numbers', () => {
    expect(subtract(5, 3)).toBe(2);
  });
});

Benefits of using describe():

• Better test organization and readability
• Scoped setup and teardown hooks
• Grouped test output in reports
• Easier to run specific test suites