A weather app provides real-time updates on temperature, humidity, wind speed, and forecasts, helping users plan their day with accurate information. It delivers weather alerts and detailed reports for multiple locations, ensuring users stay informed about changing conditions. 

Spam detection identifies and filters out unwanted or harmful messages, such as emails or comments, using algorithms to detect patterns, keywords, or suspicious behaviors. It helps protect users from malicious content, phishing attempts, and irrelevant communication.

A fire alarm detection system monitors an area for signs of fire, such as smoke, heat, or gas, using sensors and detectors. Upon detecting potential fire hazards, the system activates alarms, notifying occupants and emergency responders to take immediate action and prevent damage or injury.