Alphabetical order is a system of arranging words or items based on the sequence of letters in the alphabet. In this system, items are listed starting with the first letter of each word. If two words begin with the same letter, the second letter is considered, and so on, until a difference is found. For example, the words apple and banana would be arranged as apple first, followed by banana. This method is commonly used in dictionaries, indexes, and lists to make it easier to find information quickly. By organizing items in alphabetical order, users can efficiently locate specific entries without confusion.