noun
Refers to a computer system that allows users to post and read messages, often used in the context of early online communities or specific forums.
昔はパソコン通信の掲示板システムでよくやり取りしたものだ。
Back in the day, we used to communicate a lot on PC-based bulletin board systems.
Compound of 掲示板 (bulletin board) and システム (system), a direct translation of the English term.