People have ideas about what to put on websites. Those ideas are usually underpinned by some kind of assumption. Some assumptions are more important than others. MVPs test assumptions.
In a potted summary of his earlier workshop, Alastair Lee highlighted five different MVPs for testing different types of assumption:
Sell it first: Create a landing page or ‘fake door’ to see what people click to validate your idea that people want the product, create a video demo
Manual MVP: This is effectively a concierge service, where you do everything by hand and the customer knows this
Wizard of Oz: You do everything by hand, but the customer thinks it is being done by software
Slice: Release smallest possible thing that is valuable, usable and feasible