What is the use of the this codes? And why we using that

Question

Then what ?

Answer 1

Could you clarify your question further, e.g what programming language and what code(if asking about a specific code). I'm assuming this is a general question:

Code is used heavily in technology. The smartphone/computer you use, the apps and softwares, camera, touch support in them and even more, almost everything is made by code.

Learning to code helps you learn how to solve problems, think logically, break tasks into parts, learn how technology works.
You can use code to build websites and apps for others. This could be for simple programs or even websites for your social profile.

And coding is in high-demand in many jobs nowadays, so you can also build your career by this.