noun
Refers to the central, most important part of a system, organization, or infrastructure. Often used in compound nouns like 基幹産業 (key industry) or 基幹システム (core system).
この会社の基幹となる事業は何ですか。
What is the core business of this company?
基
Updating the core system takes time.
Compound of 基 (foundation, base) and 幹 (trunk, main part). The combination conveys the idea of a central supporting structure.