Feedback and notifications are a great way to communicate system status to users. These short, timely messages can inform users about the outcome of their actions, such as a confirmation or an error. They can also alert users about important events or changes that occur in the system, such as a new message or an update. By acknowledging and validating user actions and keeping them informed, feedback and notifications can improve user satisfaction, trust, and engagement. When designing and testing feedback and notifications, it's important to consider the type and frequency of the message, the format and mode of the message, the tone and language of the message, and the actionability and relevance of the message. All of these aspects should match the severity and urgency of the situation, suit the context and channel of interaction, offer users options to control or customize it, be polite, respectful, consistent with the system voice and personality, and provide useful information that helps users achieve their goals.