What online subscription service launched for Nintendo Switch in September 2018?

Nintendo Switch Online is the subscription service that launched for Nintendo Switch in September 2018.

The service began on 19 September 2018, replacing the free online multiplayer access that had been available on Switch from its 2017 launch. A membership enables online play in compatible games, cloud saves for supported titles, and access to a smartphone application with selected communication features. Nintendo also provides a library of classic games to subscribers.

Nintendo Switch Online has individual and family membership options. A family membership can cover multiple Nintendo Accounts in a family group, while an individual membership applies to one account. Some online features remain available without a subscription, including certain free-to-play games.

The separate Nintendo Switch Online + Expansion Pack tier adds further classic-game libraries and downloadable content benefits. It is an upgraded plan, not a different console service or a replacement name for Nintendo Account.