It is a reclining high chair, regular high chair with tray, then as the child gets older you can remove the tray and lower the seat so it becomes a booster. (babywisemom.com)
Some portable chairs are just regular high chairs that are lightweight and fold up easily, and others are small but latch onto the table without a stand. (momtricks.com)
Our son loves to stand up in regular high chairs, so this works great (because he can't). (philandteds.com)