Encrypting Code..

Question

I want to ask how do some people encrypt a code and how can you decrypt it.

Answer 1

For example??

Answer 2

For javascript you can use a tool like https://obfuscator.io/
to make your code mostly unreadable.
Python has many standard library tools that deal with compression (zip, bzip2), serialization (pickle, json) and encryption (hashlib, secrets) and tons of external cryptography libraries...