Hashing is a way to turn any data (like a password or a file) into a short, fixed code made of numbers and letters. The same input always gives the same code, but even a tiny change in input gives a totally different code.

How it works

A hashing algorithm takes the input and runs it through math steps to produce the hash. The hash can't be reversed back to the original data easily. That's why it's used for storing passwords or checking if files stayed unchanged.

Analogy

Think of making juice with a juicer. If you put in the same fruit mix, you always get the same juice. But if you change even one fruit, the taste is completely different. And once the fruit is turned into juice, you can't get the original fruit back. That's what hashing does with data.