For the purpose of internet security there is a need of highly secured information security techniques. This paper describes the Advanced Encryption Standard (AES) is a detailed description about the encoding and decoding of confidential electronic data. AES relies on the Rijndael cipher technology which is simply an algorithm that create the encoding and reversing decoding. AES is utilized in many embedded systems to provide security. Advanced Encryption Standard (AES) is that the foremost secure symmetrical cryptography technique that has achieved worldwide acceptance.