The term "iTube update" can be confusing because "iTube" is not an official product from Apple, Google, or any major tech manufacturer. Instead, it typically refers to one of three things: a third-party YouTube downloader app (often named "iTube" or "iTubeGo"), a generic term for updating YouTube on an iOS device (where apps have an "i" prefix), or a firmware update for a smart TV or streaming stick that accesses YouTube.
Depending on what you are actually using, an "update" could bring new features, fix bugs, or—in the case of unofficial apps—completely break the software. Below is a breakdown of the most common scenarios. itube update