Answer: Source program or source code.
Answer analysis:
Source program or source code is a set of instructions written by programmers in a high-level language.
Source code is an uncompiled text file written in accordance with certain programming language specifications, which contains the logic and operation instructions of the program.
These instructions are written by programmers using high-level programming languages (such as C, C++, Java, Python, etc.) to translate human-readable text into binary instructions that can be directly executed by the computer.
Through a compiler or interpreter, these source codes can be converted into machine language and executed on the computer.
High-level programming languages are easier to understand and use than low-level languages (such as assembly language) because they use abstract concepts rather than the underlying hardware operations of the computer.
This abstraction enables programmers to develop powerful software faster and improve development efficiency and maintainability.
Therefore, the source program or source code is a set of instructions written by programmers in a high-level language, which is an indispensable part of the software development process.