Why don't songs on itunes sync to iPod Shuffle?

Songs on iTunes may not sync to an iPod Shuffle due to a few common reasons. First, ensure that the songs are in a compatible format, as the iPod Shuffle only supports certain audio file types like AAC and MP3. Additionally, check if the songs are properly authorized with the Apple ID used on the iPod. Lastly, syncing settings in iTunes might be configured incorrectly, so it’s important to verify that the correct playlists or songs are selected for synchronization.