Nintendo Switch Online launches Tuesday. Here's what you need to know.

Tuesday is a big day for owners of the Nintendo Switch. On Sept. 18, Nintendo flips the switch on a new online service for the video game console, following in the footsteps of services such as Sony's PlayStation Network and Microsoft's Xbox Live. Similar to PlayStation Network and Xbox Live, Nintendo Switch Online will allow owners of the console to play games online as part of a monthly or annual subscription. Membership includes other privileges, too, including access to some of Nintendo's classic video games such as "Super Mario Bros.," "Donkey Kong" and "Tecmo Bowl." Here's everything you need to know about Nintendo Switch Online: Users must have a Nintendo account to access Switch Online.