A Letter Notice of Job Opening is a formal document from an employer or company that states they are looking to fill a specific job opening. This type of letter is usually sent to potential employers or job seekers and outlines the job description, salary, and other important information regarding the position. It may also include instructions on how to apply for the job. The purpose of the letter is to inform potential candidates of the availability of the job opening and encourage interested parties to apply. There are two main types of Letter Notice of Job Opening: Internal and External. An Internal Letter Notice of Job Opening is used to advertise a job position to current employees of the company. An External Letter Notice of Job Opening is used to advertise a job position to potential applicants outside the company.