Explain the following term with an example: Tridentate ligands.

(N/A) Tridentate ligands: These are ligands that possess $3$ donor atoms and form $3$ coordinate bonds with a central metal ion.
Example: Diethylenetriamine $(NH_2CH_2CH_2NHCH_2CH_2NH_2)$ is a common tridentate ligand. It has $3$ nitrogen atoms with lone pairs that can coordinate to the metal ion.
$(a)$ Triaminopropane: $CH_2(NH_2)-CH(NH_2)-CH_2(NH_2)$
$(b)$ Diethylenetriamine: $H_2N-CH_2-CH_2-NH-CH_2-CH_2-NH_2$