I don't quite understand the description of one parameter. Please do me a favor

Coding is equivalent to language , decode （encoding） Is the way to understand language .
For example , Your computer can only speak Chinese , There is a Japanese who writes all the documents to you in Japanese , Your computer interprets... In Chinese , Seven or eight , For example, the kana and other Chinese characters inside , But the overall meaning is still unreadable （ The statement ）. This time you give encoding A value , Tell the computer to read this article in Japanese , The computer can read Japanese .
The actual encoding and decoding process is more complex than this , But the truth is similar .