Wowza Media Server is a video streaming server written in Java. Wowza Streaming Engine can be used for live and on-demand streaming. Wowza also offers a cloud based service called Wowza Stream Cloud, Wowza Player, and additionally SDKs and APIs to build live streaming solutions. When using this tag, please clarify what Wowza product you are using in your question.
Wowza Streaming Engine is media server software written in Java with APIs for complete server-level control. Additional information can be found on https://www.wowza.com/resources/developers