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What is Passenger®?
Phusion Passenger® is an web application server. It handles HTTP requests, manages processes and resources, and enables administration, monitoring and problem diagnosis.
Phusion Passenger - the smart app server
Passenger is very easy to use, makes deploying in production much easier and is scalable. If you aren't already familiar with the benefits, you can learn more about them.
Passenger supports multiple programming languages, of which is one. Passenger can also serve multiple applications at the same time (it is multitenant).