Higher-level modules are the ones that operate on a higher conceptual level (i.e. algorithms, domain logic, business rules, etc). In other words, they’re more abstract and they govern “what” the application is supposed to do. On the other hand, modules that contain more implementation-specific code (e.g. hardware, I/O, network, etc) are said to be lower-level.
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Screams filled the laboratory – screams, thankfully, of joy. Akib Zaman, a PhD candidate at Massachusetts Institute of Technology (MIT) had just made a mini chair appear, seemingly out of nowhere.