A six-digit number is a numerical value that consists of exactly six digits, ranging from 000000 to 999999. Each digit can be any number from 0 to 9, and the position of each digit determines its value. For example, in the number 123456, the digit '1' represents one hundred thousand, while '6' represents six units. Six-digit numbers are commonly used in various applications, such as postal codes, bank account numbers, and identification numbers. They provide a larger range of values compared to five-digit numbers, allowing for more unique combinations and better organization of data.