Streaming is used in many different scenarios. Most of these use cases deal with the detection of problems, and we have a reasonable response to improve the outcome. The following are some of the use cases where stream processing has been successfully utilized:

• Financial stock price movement and prediction
• Solar power service management in real time
• Production line monitoring 
• Video conferencing and chatting
• Audio signal streaming
• Music streaming
• Virtual reality data streaming
• Supply chain optimizations
• Fraud and intrusion detection, surveillance, and their prevention
• Most smart device applications
• Traffic monitoring
• Context aware promotions, and advertising
• Computer system and network monitoring
• Geospatial data processing

For example, FlightStats is an application that processes about 60,000,000 weekly flight events that come into their data acquisition system and then turns them into real-time intelligence for airlines and millions of travelers around the world.