Coordination compound vs covalent compound

[ShastaB4C]

I get the purpose of a ligand is to attach to central atoms and forms a coordination compound but how is a coordination compound different from that of a regular covalently compound?

[Ruby Tang 2J]

The atoms in a coordination compound are held together by coordinate covalent bonds, while covalent compounds are not. Recall that a normal covalent bond is one in which 2 electrons are shared between 2 atoms. Usually each atom contributes one electron to the covalent bond, but in a coordinate covalent bond, one of the atoms contributes both electrons in the bond while the other atom contributes none. This is why NH3 is commonly present in coordination compounds, since the lone pair on the N atom contributes both electrons in the formation of a coordinate covalent bond with the central metal atom.