What are the similarities between ionic and covalent chemical bonds?

Each atom always strives to completely fill its outer electron layer with electrons. When electrons go into general use and their displacement does not occur, such a bond is called non-polar covalent.
There is also a polar covalent bond – electrons are displaced towards a more electronegative atom. It usually forms between two nonmetal atoms.
An ionic bond is a highly polarized polar covalent bond. Here the displacement is very strong, the electrons move almost completely towards the more electronegative atom. Such a bond is formed between the metal atoms or the ammonium ion (NH4) and the non-metal.
From this we can conclude: the similarity of ionic and covalent polar bonds is that electrons move towards a more electronegative atom.