Property of virtualization that allows entire virtual machines to be saved as file that can moved or copied like any other file is called encapsulation
Encapsulation refers to the idea of encapsulating data and the methods that operate on that data into a single entity, such as a Java class. This concept is also often used to hide the internal representation or state of an object from the outside world. This is called information hiding.
The general idea of this mechanism is simple. For example, some properties are not visible outside the object. Bind to methods that provide read or write access. Encapsulation allows you to hide certain information and control access to an object's internal state.
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