Encryption is the quiet technology protecting almost everything you do online — your messages, your card payments, your saved passwords — yet most people have only a fuzzy idea of what it is. The basics are simpler than they sound. Our GetMyPassword team explains what encryption is in plain language, the two main types, and where it quietly keeps you safe every day.
What encryption is
Encryption scrambles readable information into unreadable code using a key. Only someone with the right key can turn it back into the original. Think of it as a lockbox: anyone can see the box, but without the key the contents are meaningless. That is how your data can travel across the internet without strangers being able to read it.
The two main types
- Symmetric: the same key locks and unlocks the data. Fast, and used for encrypting files and disks.
- Asymmetric: a public key locks and a private key unlocks. It powers HTTPS and secure messaging, letting strangers exchange data safely without sharing one secret key.
Where you rely on it every day
Encryption is everywhere once you look: the HTTPS padlock on websites, end-to-end encrypted chats in WhatsApp and Signal, the full-disk encryption protecting a locked phone, and the secure storage in your password manager. Each one uses encryption to make sure that only you, and not an eavesdropper, can read your information.
Encryption protects data, but a password protects the key. The strongest encryption in the world is wide open if the password guarding it is weak — which is why the two always work together.
Encryption and your passwords
There is one important nuance: good websites do not even encrypt your password — they hash it, a one-way scramble that cannot be reversed, so they never store the original. Either way, the protection assumes you chose a strong password. Create unique, strong ones with our password generator, and the encryption and hashing protecting your accounts actually do their job.
Frequently asked questions
What is encryption in simple terms?
It is scrambling readable data into code using a key, so only someone with the right key can read it. It lets your information travel or be stored without strangers being able to understand it.
What is the difference between encryption and hashing?
Encryption is reversible with the key, so data can be read again. Hashing is one-way and cannot be reversed, which is why websites hash passwords — they verify yours without ever storing the original.
Does encryption make my password unnecessary?
No. Encryption protects data, but your password protects the key or the account. A weak password undermines even strong encryption, so the two must work together for real security.