This is just like a rice cooker. Since the toaster and microwave, there have been few kitchen gadgets that actually make life easier, but they are my rice cooker, my coffee pods, and my air fryer. All of them turn a common food process you need to pay attention to, to simply press a button and walk away.
And before people talk about junk and processed foods …. My air fryer is great with chicken breasts and tofu. I’ve used it to cook more actual chicken than processed chicken-like food product. An air fryer is just a tool/gadget: it’s entirely your choice what you use it for
An air fryer is a convection oven but more so.
When I looked a couple years ago there wasn’t a standard definition. But if you look at the specs of similar products from a specific manufacturer, you’d see air fryers moved more air than convection ovens
I had to get a new stove and wanted one with an air fryer but at the time there were none that were both induction stove and air fryer. I had to settle for convection oven but the only difference I found on the specs was more air movement. However the convection oven on this brand had more air movement than air fryer on a different brand
I don’t know if definitions have been standardized since then