non-store retailing
Business term for selling goods without a physical storefront, such as online, catalog, or TV shopping.
A typical example of non-store retailing is online shopping.
通信販売 specifically refers to mail-order or catalog sales, while 無店舗販売 is a broader category that includes all retail without a physical store.
Compound of 無 (mu, 'without'), 店舗 (tenpo, 'store'), and 販売 (hanbai, 'selling').