Static electricity is the build-up of electric charge on the surface of objects. It is called "static" because the charges remain in one area rather than moving or flowing to another area.
Static electricity is caused by the movement of electrons from one surface to another. When certain materials rub against each other, electrons can be transferred, leading to an imbalance of charges and the build-up of static electricity.
Common examples of static electricity include the static cling of clothes coming out of a dryer, the shock you feel when you touch a metal surface after walking on carpet, and the sparks that occur when you comb your hair in dry weather.