An altiport is like a special kind of airport that is used by planes that can't fly very high or very fast. It is usually located in a place where there are mountains or other high terrain.
The reason for this is that planes that fly at lower altitudes need a shorter runway to take off and land. Landing a plane at an altiport is kind of like landing a helicopter, as they need a short runway too.
Altiports are different from regular airports because they have a shorter runway, less traffic and they are usually located on a mountain or high terrain, where the weather can be harsh.
They are often used by small planes that transport people to remote or difficult to reach places, like ski resorts or mountain villages.
Pilots who fly to an altiport have to be specially trained for landing on short runways, and they need to be very careful because the planes will have less room to maneuver if there's an emergency.
In conclusion, altiports are small and specialized airports that are designed for planes that fly low and need to land on short runways. They are located in regions with high terrain and serve as a vital transport link to remote areas.