Serving hot food on a cold plate can be a little sad, particularly if that food is prone to cooling off quickly (looking at you, eggs). A lot of fancy restaurants have fancy plate warmers to help elevate your eating experience, but it’s unlikely you have the counter space for one of those. Instead, you can quickly heat plates by running them under hot water.
Yes, you can also use your oven, but not all plates are oven safe, and heating plates in the oven means there’s no space to heat food in the oven. (You also have to remember to put them in the oven ahead of time, which I am not always capable of.)
Instead, turn your sink on as hot as it will go, run the plate under the hot water, dry the warmed plate, and serve your food. Your meal will be just a little more luxurious.