网易 = NetEase, one of China's big internet portals;
云 = cloud;
课堂 = classroom. Launched 2012, aimed at adult skills (programming, design, office software). In 2021 it was rebranded as
网易云课堂 →
网易有道精品课/
网易有道 as NetEase consolidated its ed properties under Youdao.
