* Covalent bonds involve the sharing of electrons between atoms.

* Ionic bonds involve the transfer of electrons from one atom to another, resulting in the formation of ions with opposite charges.

In H2O2:

* Hydrogen (H) has one electron in its outer shell.

* Oxygen (O) has six electrons in its outer shell.

To achieve a stable octet (eight electrons in the outer shell), both oxygen atoms share one electron each with the two hydrogen atoms. This sharing creates two covalent bonds between each oxygen and hydrogen atom. Additionally, there is a single covalent bond between the two oxygen atoms.

Therefore, the bonding in H2O2 is entirely covalent.