Notifications are alerts that inform users about updates or events related to their applications or devices. They can appear as pop-up messages, banners, or sounds, and are commonly used in smartphones, computers, and social media platforms. Notifications help users stay informed about important information, such as new messages, reminders, or breaking news. Users can often customize their notification settings to control which alerts they receive and how they are displayed. This customization allows individuals to prioritize notifications from specific applications, like email or messaging apps, ensuring they do not miss critical updates while minimizing distractions.