Steganography is the process of hiding secret information within a cover file such as an image, audio, or video file. The secret information is hidden in a way that is not visible to the human eye. There are different types of steganography including hiding messages in still images, audio files by embedding data in the layers of MP3 files or audio noise, and video files which provide more irrelevant bits to hide data. The steps involve dragging the carrier and secret files into a steganography tool, applying a passphrase, and revealing the hidden data by the receiver. Steganography has applications in confidential communication, protecting data integrity, and digital rights management.