Personal identification number

A personal identification number, or PIN, is a special number that helps prove who you are when you want to use certain devices or services. Think of it like a secret code that only you should know. People use PINs to keep their information safe.

PINs are very important because they help protect private information. Banks use them to make sure that only the real cardholder can take money out or make purchases. Governments might use them to verify a person’s identity, and companies often use them to let employees log into computers or secure buildings.

You’ll see PINs used in many places. For example, when you take money out from an ATM or buy something with a card at a store, you usually have to enter a PIN. They are also used to log into websites that need a password, or even to unlock a car or a computer. In short, a PIN is a key part of keeping things safe in our digital world.

History

The idea of a PIN started in 1967 when the first automated teller machine (ATM) was made. This machine let people get cash from their bank accounts without going to a bank. The first ATM was created by Barclays in London and used a special number, called a PIN, to keep things safe.

Later, in 1972, a man named James Goodfellow got an award for inventing the PIN. Another inventor, Mohamed M. Atalla, made a special box that helped keep PINs safe when used with ATMs. His work helped make PINs popular around the world.

Financial services

When you use your bank card, you usually need two things to prove it's really you: a card number and a special number you choose called a PIN. The machine checks if the PIN you type matches the one it has stored. This helps keep your money safe.

PINs are usually four to six numbers long because that's easy to remember. Some banks use longer PINs, but most stick to six numbers or fewer. There are different ways banks check if your PIN is correct, and they use special tools to keep this process safe and secure.

PIN security

PINs are special numbers that help keep your information safe, like when you use a bank card. Most PINs are four numbers long, but sometimes they are six numbers. It’s important to choose a PIN that is hard to guess. Don’t use easy things like birthdays or simple number patterns.

Some systems let you pick your own PIN or change it. Many systems will stop you after a few wrong tries. Even so, it’s still important to have a strong PIN to keep your accounts safe. Experts have found that many people choose easy-to-guess PINs, which can make accounts less safe.

Reverse PIN hoax

Main article: ATM SafetyPIN software

Some people have shared stories online and through email. They said that if you type your PIN backward at an ATM, it will call for help. It would still give you your money as usual. This idea was meant to help people who might be in danger while getting cash. But no ATMs actually use this special software right now.

Mobile phone passcodes

A mobile phone can have a special number, called a PIN or passcode, to keep it safe. This PIN usually has four to eight digits and is stored in a tiny card inside the phone called a SIM card. If you enter the wrong PIN three times, the phone will stop working until you use a special code called a personal unblocking code that you get from your phone company.

This is different from the passcodes you might use to unlock the screen of your smartphone, which are not connected to the SIM card or its PIN.