"Four Digits" typically refers to a numerical representation consisting of four individual numbers, ranging from 0000 to 9999. This format is commonly used in various contexts, such as PIN codes, passwords, and identification numbers. Each digit can be any number from 0 to 9, allowing for a total of 10,000 possible combinations. In technology, four digits are often employed for security purposes, ensuring that access to devices or accounts is restricted. For example, many mobile phones and banking applications require a four-digit PIN to verify a user's identity, enhancing safety and privacy in digital transactions.