Coordination bonds (also known as dative bonds) are a type of covalent bond. But these aren't your usual covalent bonds where each atom contributes one electron to the bond, oh no! Instead, in a coordination bond, one atom is feeling generous and decides to donate both electrons to the bond. These bonds form when a super friendly atom has an extra pair of electrons, and another, needy atom comes along. That's when the magic happens!

Think about it like this: you've got a hydrogen cation (a positively charged hydrogen atom that's missing an electron). This poor cation is wandering around when it bumps into a water molecule. The water molecule, being the generous soul it is, says, "Hey, buddy, I've got an extra pair of electrons here. Why don't we bond?" And so, a coordination bond forms, and we get a new species called the hydronium ion.

And guess what? This isn't just a cool fact! Hydronium ions are super important in chemistry. They're what make solutions acidic. So, next time you're sipping on some lemonade, remember the hydronium ions are what's giving it that tart taste!