In an Integrated Development Environment (IDE), what is the code editor used for?

The code editor in an Integrated Development Environment (IDE) serves the primary function of allowing programmers to write and edit source code. This tool has features tailored for code development, such as syntax highlighting, auto-completion, and line numbering, which help facilitate efficient coding by improving readability and reducing errors.

While the IDE does encompass features for compiling code, debugging, and executing programs, those activities are separate from the core function of the code editor itself. The code editor specifically focuses on the crafting and modification of the actual text that constitutes the program's source code. Thus, option B accurately captures the essential role of the code editor within an IDE.