What are virtual appliances, and how to quickly deploy them for performance gains
Briefly

Virtual appliances are pre-configured operating systems that simplify the process of deploying server-based applications. They eliminate the need for users to install an OS, dependencies, and software individually. Instead, with virtual appliances, users can quickly launch services such as Nextcloud with minimal effort. This approach saves significant time and simplifies management, making it ideal for busy professionals or those wanting to simplify their network service deployments. Compared to traditional virtual machines, which require detailed setup, virtual appliances expedite deployment and reduce complexity.
A virtual appliance is essentially an operating system pre-configured with certain server-based services included for a single purpose.
The difference between a virtual machine and a virtual appliance is that a virtual appliance skips most of the installation process.
Using virtual appliances reduces the complexity involved in deploying applications, allowing users to launch services almost instantly.
Read at ZDNET
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