A vApp is a preconfigured virtual machine that packages applications and parameters that define operational details. A vApp packages applications with their required operating systems.

A vApp allows disparate virtual machines to work together in a stack as an application, and supports cloud-computing architectures. You can nest vApps within vApps, set up VMware resource pools, and deploy new vApps based on existing ones. VMware vApps operate on the Open Virtualization Format (OVF) standard and vApps are exported in OVF format.

Virtual Private Cloud OnDemand displays information about the vApp that contains each virtual machine; however, you do not select or manage vApps when you create a virtual machine in Virtual Private Cloud OnDemand. You manage vApps by using vCloud Director.

See Working with vApps in the vCloud Director User's Guide for information.

Managing vApps in vCloud Director allows you to save a vApp as a vApp template in your catalog. See Working with vAppTemplates in the vCloud Director User's Guide for information.

See also Create a Virtual Machine from a Template. In Virtual Private Cloud OnDemand, you use templates when creating virtual machines. A VMware template (also called a golden image) is a model copy of a virtual machine from which you can clone or deploy more virtual machines.

A virtual appliance is a generic term for an application delivered as a prebuilt unit. More specifically, a virtual appliance is a virtual machine image file consisting of a pre-configured operating system environment and a single application. The purpose of a virtual appliance is to simplify delivery and operation of an application. To this end, only necessary operating system components are included.

A virtual appliance can be deployed as a virtual machine or a subset of a virtual machine running on virtualization technology, such as VMware Workstation. Deploying an application as a virtual appliance can eliminate problems with installation and configuration, such as software or driver compatibility issues.

“vApp” is a VMware specific term for an application encapsulated within a vApp pool (which works in a hosted environment and on hypervisors). A vApp can define a number of specific things about an appliance, such as performance and resource pools, IP address allocation policies, or firewall requirements.