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Definition
An alphanumeric code is a string composed of both alphabetic characters (A–Z, a–z) and numeric digits (0–9). These codes are widely used in systems that require compact, readable, and secure identifiers, such as account numbers, promo codes, passwords, and confirmation tokens.

Why it matters
Alphanumeric codes offer a large combination space, making them useful for generating unique and difficult-to-guess values. They also help reduce errors compared to purely numeric strings, especially when users are reading or entering the code manually.

Example use case
After purchasing a subscription, a user receives an alphanumeric activation code like A9X4B7QZ to enter during software setup, ensuring their access is verified and uniquely tied to their account.