Answer:
Source code.
Step-by-step explanation:
Source code are instructions software developers or programmers write to make a software.
Source code is written in some kind of language known as a programming language. No matter the programming language, all source code is eventually compiled into a language the CPU can understand i.e. binary (1s and 0s).
Source code are written in text files and run through a terminal, but can also be written in specialized software, made for easing the process of software development, known as IDE (Integrated Development Environment).