A dry blender is a machine that helps mix different powders together. Imagine you are making a cake and you want to mix flour, sugar and salt with a spoon. It will probably take you a while and your arm will get tired. But with a dry blender, you can put all the powders in and the machine will mix them together really quickly and without any effort on your part.
Think of it like a big cup with a lid and blades inside. You put your powders in, close the lid and turn the machine on. The blades inside will spin around really fast and mix all the powders together. It's like a magic wand that makes all the powders become friends and stick together.
You can use a dry blender to mix things like flour, sugar, salt, spices, and even protein powders. It's very helpful if you're cooking or baking a lot and want to save time and energy. Just remember that you should only put dry powders in the blender, not liquids or anything else that might break the machine or make a mess.