The best representation is the Figure 2-8 of the PMBOK 7
Both Iterative and Incremental are divided in steps, so in each step you need a feedback and adapt the next steps. However the philosophy is different:
- Iterative: try different ideas to clarify the final scope. For instance the scope is to go faster from one city to another. You can build running shoes, then a bike, then a motorbike, then a car. You add features, but still you can provide multiple deliverables
- Incremental: you progressively develop the scope. So if the scope is to build a car, you can have incremental steps of building the wheels, the engine, the brakes, the chassis, but you have 1 deliverable only at the end, which is the final car