Which amongst the following is NOT part of an informal letter?

The invoice

The invoice is not part of an informal letter.

Here's why:

• Informal letters are casual and personal communications between friends, family, or acquaintances. They typically contain everyday updates, personal stories, or feelings.
• Invoices are formal documents issued by companies or individuals to request payment for goods or services. They contain specific details like the date, invoice number, amount due, and payment terms.
• The other options listed (address of the sender, salutation/greeting, and signature) are commonly found in informal letters and serve specific purposes:
  • Address: Identifies the sender and allows the recipient to respond.
  • Salutation/greeting: Establishes a friendly and personal tone.
  • Signature: Identifies the sender and confirms the authenticity of the letter.