A simple utility that downloads YouTube videos given a video URL. It demonstrates using libraries like pytube (or similar) to fetch video streams and save them locally.

• The script takes a YouTube video URL as input, fetches available streams (resolutions/formats), and allows the user to select a stream to download.
• Video files are saved to the local filesystem with a suitable filename.

Main script: (check folder for the downloader script; common names: youtube-downloader.py, YouTube downloader.py)

• Python 3.x
• pytube (install: pip install pytube) or pytube3 depending on the implementation

1. Install dependencies: pip install pytube
2. Run the downloader script and paste the YouTube URL when prompted, or pass it as an argument depending on the script's interface.

A practical example of using third-party libraries to interact with web services and handle media files. Be mindful of YouTube's terms of service when downloading content and use the tool responsibly.