This is the 4296th most frequent Japanese word.
内部
"内部" means "interior" or "inside."
内部 is used metaphorically here to refer to the inner part of the heart or one's emotions.
彼の話は私の心の内部に深く響きました。
His story resonated deeply within my heart.
内部 is used here to specifically describe the internal components of a system.
システムの内部構造を理解するのは重要です。
Understanding the internal structure of the system is important.
内部 is used here to refer to the inside part or interior of the building.