TikTok is the fastest-growing social-media platform, and it's particularly popular among members of Generation Z.

The app – known formally as Musical.ly – relies on sounds uploaded by users or artists for use by other TikTok creators.

Popular TikTok sounds are diverse in origin — some have been created by TikTok users themselves, while others are viral clips of celebrities, like Kourtney Kardashian.

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TikTok is taking over the internet.

It's the fastest fastest-growing social-media platform on the web, and the app has become a ubiquitous element of Gen Z life.

Despite security concerns around TikTok's Chinese ownership, it seems like everyone is getting in on the fun, including celebrities like Lady Gaga, nurses, and even US soldiers.

As it has grown, TikTok has evolved and has become a marketplace for short bits of audio that users can upload for others to use in their own videos. While mainstream music frequently thrives on the app, other sounds from pop culture and elsewhere have also become earworms.

Here are some of the most popular sounds being used on TikTok and where they originated.