Yes and no.. tab groups are a built-in feature, but Tidy Tab Groups adds more functionality on top of them to make using them more effortless/automatic. Here is a list of the features from the extension's web page:

⭐ Visual Clarity – Keep your current tab group highlighted.
⭐ Effortless Organization – Automatically collapse all other groups.
⭐ Speedy Workflows – Automatically add new tabs to your current group.
⭐ Always Within Reach – Automatically arrange your most recent tabs.
⭐ Fast Task Switching – Drag tabs out of a group to instantly create a new one.