Twitch.Tv is a live broadcasting service used for showing footage of games and other activities. Mining Simulator may be streamed by a member of Rumble Studios. Streams are announced on the Mining Simulator Discord, and Rumble Studios may be followed for notifying you of a new stream.
Rumble Studio's official twitch can be found here: https://www.twitch.tv/rumble_studios .
Twitch Items and Codes
Certain codes may be revealed on the Twitch, gifting viewers with items. Most of these can only be redeemed while a live stream is going on, though a user doesn't need to be watching. Many cosmetics are named after this service, only available using the exclusive codes.
Giveaways may also occur on a stream, giving exclusive items such as otherwise unobtainable Shinies.