What holds the atoms together in a covalent bond

In covalent bonding, both atoms are trying to attract electrons--the same electrons. Thus, the electrons are shared tightly between the atoms. The force of attraction that each atom exerts on the shared electrons is what holds the two atoms together.

the attraction between shared electrons and protons in each nucleus

Explanation:

gravititional force is a force that is acting around you, it is non-contactable and it is a force that pulls you to the core of the earth.

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a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up