GPG (GNU Privacy Guard)

GPG (GNU Privacy Guard) is a free tool used to secure digital communication by encrypting emails and files, ensuring only intended recipients can read them. It works through a system of public and private keys: you share your public key so others can send you encrypted messages, while you keep your private key secret to decrypt incoming messages. GPG also provides digital signatures, allowing senders to prove their identity and confirm that the message hasn't been altered. Overall, GPG helps protect privacy and verify authenticity in digital exchanges without relying on commercial services.