Business letters are those kinds of letters which are written for a formal or business related purpose. These letters are exchanged between business organisations and can also be written and sent within a company. These are one of the most widely used categories of letters and must have a strict formal format of writing. A business letter can be used to serve many different purposes and based on this it is divided into several categories. The following is a list of the major different types of business letters:

• Job application letters: A job application letter is a kind of a business letters which is used by an individual to apply for a job in a business company or an organisation. These letters are used to give the details of the qualifications of the applicant and are generally attached with resumes or curriculum vitas.
• Resignation letters: a resignation letter is a popular kind of a business letter which is written in the case when an employee of a company wishes to resign from work and writes a letter to the employer to inform him/her about this. These letters must state the reason due to which the employee wishes to resign.
• Employee introduction letter: an employee introduction letter is a kind of a letter which is used by an employer to introduce a new employee to the rest of the staff. These letters are addressed to a group or team of working staff.
• Agreement letters: agreement letters are those kinds of business letters which are used to lay down the terms and conditions of a business contract or agreement and inform the other business organisation about the details of the agreement formed between the two parties.
• Cover letters: this category of letters is also used by aspiring employees to give the details of their skills and qualifications to the employer or recruiter.