Explain Redis Pub/Sub messaging system with examples.

Redis Pub/Sub enables message passing between publishers and subscribers: **Basic Pub/Sub:** # Subscribe to channels SUBSCRIBE news sports weather PSUBSCRIBE news:* # pattern subscription # Publish messages PUBLISH news "Breaking: Redis 7.0 released" PUBLISH sports "Game result: Team A wins" **Python Publisher:** import redis r = redis.Redis() # Publish messages r.publish('notifications', 'User logged in') r.publish('alerts', 'High CPU usage detected') **Python Subscriber:** import redis r = redis.Redis() pubsub = r.pubsub() # Subscribe to channels pubsub.subscribe('notifications', 'alerts') pubsub.psubscribe('user:*') # pattern subscription # Listen for messages for message in pubsub.listen(): if message['type'] == 'message': print(f"Channel: {message['channel']}") print(f"Data: {message['data']}") **Use Cases:** • Real-time notifications • Chat applications • Live updates • Event broadcasting