Some (mostly American?) people know Mahjong as a solitaire game [1] that they likely have played on their phone or Windows PC/Mac.
This article is talking about the (arguably less known?) 4-player competitive game [2], and assumes you already know the difference (which some may not).
This article is talking about the (arguably less known?) 4-player competitive game [2], and assumes you already know the difference (which some may not).
[1] https://en.wikipedia.org/wiki/Mahjong_solitaire
[2] https://en.wikipedia.org/wiki/Mahjong