Coding is programme writing. Basically it is a digital language used to develop applications, websites and softwares and the code is what tells our computer what to do. Coding is writing instructions for a computer to perform. The instructions, called source code, are written in special languages that are unlike natural human languages. It also involves planning, testing, and debugging source code.
Large pieces of software – like Windows, OS X, and big-budgets games – are made up of millions and millions of lines of code. When you have that much code, you need to plan out how the code will be written, and how different parts of the code will work together. This kind of planning is called design or architecture. On large projects, a lot of time is spent designing and architecting before code is written.
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