ブラックボックスとは、その機構の原理や構造が不明の状態でも、その機能や利用法を知ってさえいれば十分に価値を引き出し利用する事のできる装置や機構の概念である。また、内部構造が知覚出来ないように密閉された機械装置や機構を指す。
The concept of a "black box" is that of a device or mechanism whose value can be fully extracted and utilized even when the principle and structure of the mechanism are unknown, as long as its function and usage are known. It also refers to a mechanical device or mechanism that is hermetically sealed so that its internal structure cannot be perceived.