Gost (pronounced "ghost") is a type of encryption that helps keep information safe and secret when it's being sent or stored online.
Imagine you have a diary with all your secrets written inside. If someone else were to find your diary, they could read all your secrets and know everything about you. That's why you might want to hide it somewhere safe or lock it up with a special key, so that only you can access it.
Gost works in a similar way. It takes the information you want to keep secret (like a message, a password, or even a file) and "locks" it up using a special code. Without the right code, nobody else can read or see your information.
But just like a key, this special code has to be difficult for others to guess or figure out. Gost uses a complex mathematical algorithm to create this code, making it very hard for anyone else to break in and see your information.
So it's like having a secret diary that nobody else can read or find, except this time it's all done with computer codes!