Alphanumeric characters are pairs of number characters and letters that may be mistaken for one another. In English, alphanumeric characters are the 26 letters from A to Z and the 10 Arabic numerals from 0 to 9. They are used in several real-life scenarios, such as creating a username, typing a PIN into an ATM, writing an email, writing computer code, and data entry. Alphanumeric characters are also used in computer programming languages because they are natural for people to read and enable us to write computer code that others can easily understand. Any machine can correctly display alphanumeric characters, which is not always true of special characters. Using alphanumeric characters makes data display more reliable.