What are different kinds of ramps for wheelchairs?

There are several types of ramps for wheelchairs, including portable ramps, threshold ramps, and permanent ramps. Portable ramps are lightweight and designed for temporary use, making them ideal for travel. Threshold ramps provide a small incline for doorways or steps, while permanent ramps are typically built into structures for long-term access. Additionally, folding ramps and telescoping ramps offer versatility in storage and transport.