What are dπ-dπ, pπ-pπ, and dπ-pπ types of bonding?

CBSE Class 11
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What are dπ-dπ, pπ-pπ, and dπ-pπ types of bonding? What are the differences between all? Compare.

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pπ–dπ bonding:
In this type of bonding electrons are donated from the filled p-orbitals of the ligand to the empty d-orbitals of the metal.
Examples: RO-, RS-, O2-, F-, Cl-, Br-, I-, R2N-, PF3

dπ–dπ bonding:
In this electrons are donated from filled d-orbitals of the metal to the empty d-orbitals of the ligand.
Examples: R3P, R3As, R2S

pπ– pπ bonding:
In this type of bonding p-orbital of one atom overlap sideways with p-orbital of another atom which results in the formation of π-bond, known as pπ– pπ bond.
Examples: C = O, C ≡ N