What are solids?
Solids have a definite shape and definite volume. Which means their shape will stay the same, and so will their volume. Say you have a solid, and you weigh it, and it's 19 grams. After a day, when you weigh it again, it will have the same weight (19g). It will also take up as much space.
Solid molecules
http://www.chem.purdue.edu/gchelp/atoms/states.html
Solid molecules are in a tight, neat, pattern. They don't move around as much, but they do vibrate. Look closely at a solid. Imagine what is inside of that:Molecules vibrating. It may not feel like it, but they are!
examples of solids
There are loads of solids in our world, but here are just a few. All of your school supplies are solids ,all of your clothes are solids, and this computer/phone is a solid.