How to say "Introduction" in Japanese

When translating "introduction" into Japanese, you must choose carefully between 紹介 and 概論. In Japanese, 紹介 (しょうかい (shōkai)) is typically associated with "introduction" (Syllabus Level: N4) and represents The act of introducing someone or something. Often used with する. On the other hand, 概論 (がいろん (gairon)) maps to "introduction, general remarks, outline, general survey" (Syllabus Level: N2) and represents A general survey or introduction to a subject, often used as a textbook title or for the initial part of a lecture. Provides an overview rather than deep detail.. A literal translation of "introduction" can often sound unnatural to native Japanese speakers if mixed up!