That's Amore Pizza Plate with Inscription 32cm Bitossi Home

Pizza plates are ideal for serving pizza because they are usually larger, with a bigger diameter than regular plates.
A dinner plate is usually about 24-26 cm in diameter, while pizza plates range from 30 to 34 cm.
The base is completely flat to make slicing easier. Most of the time the rim is only just hinted at, just enough to hold the food while carrying it and during the meal.
These features also make them easy to wash, by hand or in the dishwasher, and to stack.
They can be completely white or have all kinds of decorations, but almost always on a white or light background.

The answer is "it depends". Hard porcelain or ceramic plates specifically marked "oven-safe" can also be used directly to reheat pizza or slices of it, but it is important to avoid thermal shock, for example going from the cold of the fridge to the heat of the oven, to prevent cracks.

If the pizza plates are porcelain with underglaze decoration, yes. If they have raised decorations or metallic finishes, hand washing is recommended so that heat and aggressive detergents do not fade the design over time. With metallic finishes, be a little more gentle with the sponge, especially the green scouring side.

Some professional pizza plates have a slightly rough base. This creates a very thin layer of air between the hot pizza and the plate, preventing steam from making the pizza base soggy or rubbery and preserving its crispness.

White has historically been pizza makers' favourite colour because it highlights the contrast between the red of the tomato, the white of the mozzarella and the green of the basil (the colours of the Italian flag), making the pizza look more appetising.