loader
n.a small computer program that prepares other software to run. It moves the program's data into the computer's memory so you can start using it.
n.a utility program responsible for copying an executable file from storage into main memory and preparing it for execution. Often operates as a component of the operating system's kernel.
“The game takes a few seconds for the loader to finish.”
“If the system loader cannot find the necessary library files, the application will fail to launch and display an error message.”
“Modern operating systems use a dynamic loader to link shared libraries at runtime, which helps reduce the overall memory footprint of multiple concurrent processes.”
In computing contexts, it refers specifically to the software component; in industrial contexts, it refers to heavy machinery or a person who loads cargo.
From load + -er.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.