The action of coding is to write programming statements for a program.
The action of coding is to write programming statements, or in other words, write the source code for a program.
In communications as well as information processing, code is a system of rules that converts information into another form, which is shortened or secret. This is essentially the process that revolves around encoding, which converts information from a source into symbols for communication or storage. On the other end of this spectrum, we have decoding, which is the reverse process that converts code symbols back into a form that we understand.
In cryptography specifically, code has both specific technical meanings and general meanings. If we look at it from a technical viewpoint, code is the substation of one word or phrase by another word, number or symbol. This is done to conceal the original word or phrase.
Join the thousands already learning crypto!