why we use microwave oven?

Reheat, cook.

I use my microwave everyday.  Cooking reheating etc

I use mine for all my cooking. Reheat my pizza, tea, steam veggies and warm my bread.

Your aunt Betty Sue sent your family that one piece of apple pie for all of you. Best served warm, but..........................that's going to be a mighty small sliver, each. Cheap ol' aunt Betty Sue. -_-

If you leave it, how could you reheat foods nice and quick?

The convenience of time.

Before Microwaves, reheating food items was an endeavor just shy of remaking the entire meal . . . .

OH my gosh I almost jumped out of my seat for JOY for this question! Oh this is a question after my own HEART!!!! Why I use microwave???? So my family wont starve!!! Lolololo!!! It helps us BAD cooks in the kitchen.... Trust me! Im an expert!!!! 😂😂

Hello there, my mother and my sister often bake cakes in the
oven. They melt ingredients such as butter and chocolate. We may also use it to
heat water to prepare tea or coffee, as it is less time consuming than using a
kettle. Also, microwave is helpful to reheat leftover before consuming.

For convenience?

To heat our meals lol

It is more convenient than using oven