When we talk about weight we want to know how heavy something is. We pay for fruit, vegetables and meat by the pound. Trucks have to stop at weigh stations on the highway to find out how much their loads weigh.
People weigh themselves to see if they gained weight.
Medicines doses are determined by weight. Using a balance scale find two household objects that weigh the same. Find an object that would equal half of one of your objects. Put two on the same side and one of the first objects on the other side. Try pens, pencils, erasers, paperclips or whatever you have handy.