Today, the Internet has become indispensable for finding information, communicating, doing business, even shopping, etc. The world of the Internet is developing rapidly. New offers and services appear every day. The World Wide Web (World Wide Web) (worldwide (global) network, world wide web) and the information available in it, not in the sense of the physical Internet itself. This usage can be explained by parallels with the terms "radio" and "television". KEY - a tool for locking and unlocking a lock, bolt, information used to encrypt and/or decrypt a message.