What is an Encryption And Decryption

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Encryption(Make eg (plaintext) that is human readable difficult to understand hide information).
Decryption(Take it back to normalized data (plaintext) that is human readable or the computer can understand).

>>> word = 'hello world'
>>> encrypt = word[::-1]
>>> encrypt
'dlrow olleh'

>>> decrypt = encrypt[::-1]
>>> decrypt
'hello world'