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Business Communication · Business Correspondence

Business Letters: Meaning, Functions and Parts

Updated 11 October 2026 · Fact-checked

A business letter is a formal written message used to carry out business dealings with people outside or inside an organisation. It informs, requests, records and persuades. To answer exam questions, define it, list its functions, then name the parts in order: letterhead, reference, date, inside address, salutation, subject, body, complimentary close, signature.

Understand Business Letters: Meaning, Functions and Parts

A business letter is a formal, written message sent from one business or person to another to conduct business. It can go to customers, suppliers, banks, government offices or employees. It follows a set structure and a polite, clear tone.

Business letters matter because they give a written record. If a dispute arises over an order, price or delivery date, the letter is proof. They also build goodwill, since a well-written letter shows that the firm is professional and respects the reader.

The main functions are: to inform (give facts), to request or enquire, to persuade (sales and promotion), to record agreements and decisions, to build and keep relations, and to serve as legal or reference evidence later.

A letter has parts, and each has a job. The letterhead tells you who is writing. The reference and date help filing and tracing. The inside address says who receives it. The salutation greets. The subject line gives the topic. The body carries the message. The complimentary close and signature end it politely and confirm who is responsible.

In the exam, you may be asked to define a letter, list its functions, or name and explain its parts. Learn the order of parts, because a mixed order loses marks.

Key rules to remember

Standard order of parts
Letterhead → Reference no. → Date → Inside address → Salutation → Subject line → Body → Complimentary close → Signature → Designation
Optional parts such as attention line, enclosures and copy-to (cc) come where the style requires them. Enclosure and cc go at the end.
Body structure
Opening paragraph → Main paragraph(s) → Closing paragraph
Opening states the purpose, middle gives details, and the close states the action expected.
Salutation and close pairing
Dear Sir / Madam → Yours faithfully; Dear Mr Sharma → Yours sincerely
Use the formal pair when you do not know the name. Use the second when you address a named person.

How to solve Business Letters: Meaning, Functions and Parts questions

Use this method for any question on the meaning, functions or parts of a business letter.

  1. 1Read the command word. 'Define' needs a short meaning. 'List' needs points. 'Explain' needs a line on each point.
  2. 2Start with a one or two line definition: formal written communication used for business purposes.
  3. 3Give the functions or importance as short numbered points, each with a few words of explanation.
  4. 4For parts, write them in the correct order, with one line on what each part does.
  5. 5Add a small layout sketch or a sample letter if the question asks you to draft a letter.
  6. 6Mention optional parts such as attention line, enclosure and cc.
  7. 7End with one line on why a correct structure matters: clarity, record and goodwill.

Quickest way: Memory order for parts

When to use it: Use this when time is short and you must list the parts of a letter in the right order.

  1. Think top to bottom: who writes (letterhead), tracking (reference, date), who receives (inside address).
  2. Then greeting and topic: salutation, subject.
  3. Then the message: body.
  4. Then the exit: complimentary close, signature, designation.
  5. Last, add-ons: enclosure, cc.
  6. For functions, recall: inform, request, persuade, record, build goodwill, provide proof.

Common mistakes in Business Letters: Meaning, Functions and Parts

  • Writing the parts in the wrong order, such as placing the date after the salutation.

    Students memorise the names but not the sequence.

    Fix: Revise top to bottom: letterhead, reference, date, inside address, salutation, subject, body, close, signature.

  • Pairing 'Dear Sir' with 'Yours sincerely'.

    Students think both closes mean the same.

    Fix: Use 'Yours faithfully' with Dear Sir or Madam, and 'Yours sincerely' with a named person.

  • Confusing the reference number with the inside address.

    Both appear near the top.

    Fix: The reference is a file or code number of the sender. The inside address is the name and address of the receiver.

  • Leaving out the subject line or writing it as a full sentence.

    Students treat it as part of the body.

    Fix: Write it as a short, clear heading below the salutation, such as 'Subject: Order for 200 notebooks'.

  • Listing functions without any explanation.

    Students rush to finish.

    Fix: Add a few words to each point, for example 'Record: gives written proof of deals'.

  • Forgetting to sign and add designation, or leaving out enclosure notes.

    Students think the body is all that matters.

    Fix: Finish with the signature block and an 'Encl.' line if documents are attached.

Worked examples

Example 1

Explain the main functions and importance of business letters.

Show the solution
  1. Define: a business letter is a formal written message used to carry out business dealings.
  2. List the functions: to inform, to request or enquire, to persuade, to record, to build goodwill.
  3. Explain each with a short phrase: inform means share facts like prices; record means keep proof of orders; goodwill means create a good image.
  4. State the importance: it gives legal evidence, reaches distant people, can be filed and checked later, and shows the firm's professionalism.

Answer: Business letters are formal written messages that inform, request, persuade, record agreements and build goodwill. They are important because they provide written proof, support relations with outsiders and can be referred to in future.

Example 2

Name and explain the parts of a business letter in the order in which they appear.

Show the solution
  1. Letterhead: the firm's name, address, contact details and logo at the top.
  2. Reference number and date: the first helps in filing, the second fixes the time of writing.
  3. Inside address: name, designation and address of the receiver.
  4. Salutation: the greeting, such as 'Dear Sir'.
  5. Subject line: a short heading stating what the letter is about.
  6. Body: the message, in opening, middle and closing paragraphs.
  7. Complimentary close: 'Yours faithfully' or 'Yours sincerely'.
  8. Signature and designation: confirm the sender and authority. Then add enclosure and cc notes if needed.

Answer: The order is letterhead, reference, date, inside address, salutation, subject, body, complimentary close, signature and designation, followed by enclosure and cc where required.

Exam tips

  • Always write the parts in order and add one line of purpose to each. Bare lists earn fewer marks.
  • If asked to draft a letter, show every part, including subject line and enclosure, because marks are often given for format.
  • Learn the salutation and close pairs. They are a favourite small question.
  • Use numbered points for functions. They are quick to write and easy for the examiner to mark.
  • Spend the 15 minutes of reading time choosing which letter or theory question to attempt first.

Practice questions from Business Correspondence

Business Letters: Meaning, Functions and Parts in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Business Letters: Meaning, Functions and Parts: frequently asked questions

What are the main parts of a business letter for CSEET?

The main parts are letterhead, reference number, date, inside address, salutation, subject line, body, complimentary close, and signature with designation. Enclosure and cc are added when needed. Learn them in this order.

What is the difference between 'Yours faithfully' and 'Yours sincerely'?

Use 'Yours faithfully' when you begin with Dear Sir or Madam and do not know the name. Use 'Yours sincerely' when you address a named person such as Dear Mr Sharma.

Why are business letters still important?

They give a written record, which serves as proof in disputes. They also build goodwill and let a firm communicate formally with people far away. They can be filed and checked at any time.

Is the subject line compulsory?

It is not compulsory in every style, but it is strongly advised in business letters. It tells the reader the topic at a glance. In the exam, include it in any letter you draft.