https://www.techradar.com/news/nintendo-online-service-confirmed-for-late-september

Nintendo has narrowed down the release date for its Nintendo Switch Online service, confirming on Twitter that it will debut in the second half of September this year.

Nintendo Switch Online is a paid service that grants members access to online multiplayer and a growing selection of NES games, essentially making it Nintendo’s version of Xbox Live or PlayStation Plus. In addition, members will have access to a Nintendo Switch Online app and a ‘save data cloud backup’.