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What is symmetric key algorithm?

What is symmetric key algorithm?

Symmetric key algorithms are a class of algorithms for cryptography that use trivially related, often identical, cryptographic keys for both encryption of plaintext and decryption of ciphertext. The encryption key is trivially related to the decryption key, in that they may be identical or there is a simple transformation to go between the two keys. The keys, in practice, represent a shared secret between two or more parties that can be used to maintain a private information link. Other terms for symmetric key encryption are secret key, single key, shared key, one key, and private key encryption. Use of the last and first terms can create ambiguity with similar terminology used in public key cryptography. Symmetric key cryptography is to be contrasted with asymmetric key cryptography.