Safe website designed for joining a lobby for a Jackbox Party Pack game through a 4-letter room code. You can receive adult or otherwise sensitive content (primarily text, but can be in the form of art if provided in a drawing game like Drawful or Civic Doodle) from other players (and the game, if Family Friendly is toggled off,) but in games where it's available (like Quiplash) there is a manual censoring setting available where the VIP (the player that joined in first) can censor answers from other players if they're deemed inappropriate. You can also connect your Twitch account to the game if a lobby has settings enabled so only people with Twitch connected (which will have their name set as their Twitch username) can join, likely so if a user misbehaves, they can be punished accordingly.
TL;DR. jackbox.tv is a safe website made for connecting to a Jackbox Party Pack lobby via a 4-letter room code. Adult content can be received, but can be toggled off if given by the game itself or censored if you're the VIP if the Manual Censoring setting is turned on.