A YouTube to MP4 converter is a tool that allows users to download and convert YouTube videos into MP4 format for offline viewing. MP4 is widely supported across various devices, offering a balance of high video quality and manageable file size. These converters are helpful for those who want to watch content without an internet connection, archive favorite videos, or use clips for personal projects. Many converters are available online, ranging from free web-based options to more advanced desktop software.