Smartphone notifications are alerts that inform users about various activities or updates on their devices. These notifications can come from apps, messages, emails, or system updates, and they typically appear as banners, sounds, or vibrations. They help users stay connected and informed without needing to constantly check their phones. Users can customize their smartphone notifications to prioritize important alerts and silence less critical ones. This feature allows for a more personalized experience, helping individuals manage their time and attention effectively. Notifications can be managed through the device's settings, where users can choose which apps can send alerts and how they appear.