The compound CCl4 is an example of a compound that has a covalent bond. In chemistry, compounds can either have ionic or covalent bonds, and each type of bond makes the compound behave differently.
Covalent compounds are comprised of molecules that share their valence electrons. In contrast, ionic compounds are comprised of molecules that transfer their electrons to other molecules.
Covalent compounds are highly stabilized due to their electron sharing, and can be found as gases, liquids or solids. They also have low melting points and low boiling points, and are very poor electrical conductors. All of their properties are due to the way that covalent compounds share electrons.