Ionic bond is a chemical bond (metal with non metal) in which one atom loses an electron to form a positive ion and the other atom gains an electron to form a negative ion. While on the other hand, covalent bond is a chemical bond (non-metal with non-metal) that involves sharing a pair of electrons between atoms in a molecule. How to illustrate an ionic bond is by using a cross and dots to indicate the electrons, using brackets for every element you draw and write the charge at the right top of the outside bracket. Also put the name of the element for the first shell. On the other hand, to illustrate the covalent bond, you just need the last shell and it'll look like venn diagram and the intersection between the shells (the middle part) is for you to put how many electrons are shared among them.
The examples of a covalent bond is like NH3 and also CH4.
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