A TikTok downloader is a tool or application that allows users to save TikTok videos onto their devices for offline viewing or sharing. TikTok downloaders typically work by extracting the video file from TikTok's servers and then providing a download link or saving the file directly onto the user's device. They can be web-based services, browser extensions, or standalone software applications available for various platforms like smartphones, tablets, and computers. However, it's important to note that downloading TikTok videos without the creator's consent may violate TikTok's terms of service or copyright laws in some jurisdictions.