Downloading a YouTube video for offline viewing is straightforward and can be done using various methods. One popular approach is to use a third-party browser extension, such as Video Downloader Professional or KeepVideo, which allow users to select specific videos and download them without internet connectivity. These extensions often bypass YouTube's anti-downloading measures and enable seamless downloads. Alternatively, users can utilize online tools like 4K Video Downloader, ClipConverter, or YTD Downloader, which provide easy-to-use interfaces for downloading individual videos in various formats, including MP4, AVI, or MOV. When it comes to copyright concerns, it's worth noting that downloading YouTube content without permission may infringe on the rights of content creators. However, most mainstream video hosting platforms like YouTube offer official channels and APIs for accessing content programmatically, making it possible for developers to create tools that respect copyright laws while still enabling offline playback.