According to TechTarget, "Cryptography is a method of storing and transmitting data in a particular form so that only those for whom it is intended can read and process it.​"

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Below is a collection of sources I think will enable you to have a better understanding of what cryptography is:

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What is cryptography? A video story which takes us from Caesar to Claude Shannon created by Brit Cruise at the Khan Academy:

https://www.khanacademy.org/computing/computer-science/cryptography/crypt/v/intro-to-cryptography

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Internationally renowned security technologist Bruce Schneier answers questions about security, privacy, and cryptography:

https://www.youtube.com/watch?v=0XDWYzWqFG8

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An Overview of Cryptography by Gary C. Kessler:

https://www.garykessler.net/library/crypto.html

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