1) A container is an isolated guest in container-based virtualization. Container-based virtualization uses a single kernel to run multiple instances of an operating system. Each instance runs in a completely isolated environment, so there is no risk that one container can gain access to another’s files.
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2) In Sun Microsystems' JavaBeans component architecture and in Microsoft's Component Object Model (COM), a container is an application program or subsystem in which the program building block known as a component is run. For example, a component - such as a button or other graphical user interface or a small calculator or database requestor - can be developed using JavaBeans that can run in Netscape containers such as browsers and in Microsoft containers such as Internet Explorer, Visual Basic, and Word.