Playback devices are electronic gadgets that allow users to listen to or view audio and video content. Common examples include smartphones, tablets, DVD players, and smart TVs. These devices can play various formats, such as MP3 for audio and MP4 for video, enabling users to enjoy their favorite media. Many playback devices also connect to the internet, allowing access to streaming services like Netflix and Spotify. Some devices support additional features, such as Bluetooth connectivity for wireless audio playback or 4K resolution for high-definition video. This versatility makes playback devices essential for modern entertainment.