A wireframe is basically the figures with outlines and a sample of where things are going to be.

A mockup is a wireframe with design basically how is supposed to be but without real images and text.

A prototype is basically a mockup with real stuff to test if it works.

Or so I see it that way.

• Mockup = low fidelity sketch or design in some graphic design application or on a napkin
• Wireframe = layout of the project's structure or storyboard based on the mockups
• Prototype = low level functioning project based on the wireframes and mockups for the purpose of testing the project in the environment in which it's meant to exist.

I guess wireframe is a mockup of wireframes, no colors or backgrounds

Mockup is a sketch, drawn

Prototype is an actual product that is prototyping the final product. Like before alpha release.

wireframe -- a quick sketch consisting of lines and/or zones

mockup -- something "mocked up" ...lol in photoshop. A static graphic representation of what the finish product could look like. Usually not polished or containing anything more than lorem ipsum as far as content goes

prototype -- something actually running on the intended platform. eg: a site at localhost or an app running in the emulator.