What is an input mask for a postcode on Microsoft access?

An input mask for a postcode in Microsoft Access is a predefined format that controls how data is entered into a specific field, ensuring consistency and accuracy. For example, a common input mask for a UK postcode might use the format "L9 9LL," where "L" represents a letter and "9" represents a digit. This helps users enter postcodes correctly by providing visual cues and restricting input to valid characters. Input masks can also include placeholder characters, making it clear where and what type of information is required.