Final answer:
Steganography is the practice of concealing a message within another medium, making the message's presence undetectable.
Step-by-step explanation:
Steganography is the practice of hiding messages or information within another non-secret, visible message or a digital file. This technique enables the concealment of secret data within the carriers like images, videos, or audio files. Unlike cryptography, which protects the content of a message by transforming it into an unreadable format, steganography hides the existence of the message itself. An example of steganography might be hiding a text message within the least significant bits of an image file such that the alterations are imperceptible to the human eye, thereby transmitting information covertly.