internals; internal details
Computing term referring to the inner workings, structure, or implementation details of a system, program, or component.
The internals of this library are not documented.
Understanding the internal details allows you to write more efficient code.
内部構造 emphasizes the physical or logical structure, while 内部詳細 focuses on the detailed specifics of the inner workings.
実装 refers to the actual implementation or code, whereas 内部詳細 can include design decisions, data flow, and other internal aspects beyond just the code.
Compound of 内部 (internal) and 詳細 (details).