What is the Difference Between Linker and Loader?

The linker and loader are utility programs that play crucial roles in the execution of computer programs. Here are the main differences between them:

• Function: The linker's main function is to generate executable files by combining object code generated by the compiler and assembler, as well as other code and libraries. The loader's main objective is to load executable files to main memory for further execution.
• Input: The linker uses an input of object code produced by the assembler and compiler. In contrast, the loader uses an input of executable files produced by the linker.
• Output: The linker produces executable files. The loader loads executable files to memory and prepares them for execution.
• Errors: Linker errors can lead to unresolved symbols and incomplete programs, while loader errors involve memory allocation, relocation, and execution issues.
• Types: There are two types of linkers: linkage editors and dynamic linkers. There are four types of loaders: absolute, direct linking, bootstrap, and relocating.

In summary, the linker is responsible for creating executable files by combining object code and libraries, while the loader is responsible for loading those executable files into memory for execution.

Comparative Table: Linker vs Loader

Here is a table comparing the differences between a linker and a loader:

In summary, a linker is responsible for combining object files and other code created by the assembler to produce an executable module. On the other hand, a loader is an operating system component that loads the executable module into the main memory for execution.