Smartphone accessories are additional items designed to enhance the functionality and usability of smartphones. Common accessories include phone cases, which protect devices from damage, and screen protectors, which safeguard screens from scratches. Other popular items are portable chargers that provide extra battery life and headphones for improved audio experiences. Additionally, accessories like car mounts allow for hands-free navigation, while Bluetooth speakers enhance sound quality for music playback. Stylus pens can improve precision for tasks like drawing or note-taking. Overall, these accessories help users personalize and optimize their smartphone experience.