An application platform for hosting your apps that provides an innovative modular, cloud-ready architecture, powerful management and automation, and world class developer productivity.
Apache Tomcat powers numerous large-scale, mission-critical web applications across a diverse range of industries and organizations.
Jetty is used in a wide variety of projects and products, both in development and production. Jetty can be easily embedded in devices, tools, frameworks, application servers, and clusters. See the Jetty Powered page for more uses of Jetty.
It is a flexible performant web server written in java, providing both blocking and non-blocking API’s based on NIO. It has a composition based architecture that allows you to build a web server by combining small single purpose handlers. The gives you the flexibility to choose between a full Java EE servlet 4.0 container, or a low level non-blocking handler, to anything in between.
An Application Server means, It can manage Java EE applications You should use GlassFish for Java EE enterprise applications. The need for a seperate Web server is mostly needed in a production environment.