Final answer:
Block coding is used to categorize and represent different classes of items within a coding scheme by assigning them to specific ranges, which helps to structure data and facilitate easy retrieval and identification.
Step-by-step explanation:
The concept described in the question refers to a coding system that addresses certain limitations of sequential codes by assigning specific ranges within the coding scheme for different classes of items. This method is known as block coding. Block coding helps in organizing and representing different categories or classes in a structured and distinct manner within a coding system. For example, using block coding, one could separate different topics or subjects into non-overlapping numerical or alphabetical ranges, making it easier to identify and retrieve information related to each specific category.
While Gray coding is used for minimizing errors in digital communication, prefix coding ensures no code is the prefix of another, and redundant coding involves adding extra bits for error detection and correction, block coding specifically is used for categorizing and segmenting data into blocks for easy navigation and use.