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What is a virtual proxy?

According to www.dofactory.com and www.blackwasp.com, a virtual proxy is used to represent a simplified version of a complex object. Only when an object part is required does the main object actually fill up, providing a lazy loading form. Does this mean when use uses lazy loading, we can call it a virtual proxy? Are there other reasons why we should use it, except when using an expensive facility? I do not see it alive. Can someone give a good explanation, please?

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I never felt the need to do this, but you can use Virtual Proxies to lazily initialize expensive graphic objects . However, you rarely need to do this.

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