I was reading Wikipedia's definition of Dependency inversion principle, and it uses two terms High-level modules and low-level modules, which I wasn't able to figure out.
What are they and what does Dependency inversion principle have to do with them?
This is explained here: https://softwareengineering.stackexchange.com/a/419630
Low level modules are "low level" because they have no dependencies, or no relevant dependencies. Very often, they can be easily reused in different contexts without introducing any separate, formal interfaces - which means, reusing them is straightforward, simple and does not require any Dependency Inversion.
High level modules, however, are "high level", because they require other, lower level modules to work. But if they are tied to a specific low-level implementation, this often prevents to reuse them in a different context.
