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aka H-bond. a noncovalent (no-electrons shared) attraction between molecules. It can be more helpful to think of them more as attractions than “bonds” because they’re “easily” reversible. The attraction comes from oppositely-charged partial charges liking each other and “hydrogen bond” is just a special name for when you have a molecule with partially-positive H (the H donor) (which is partially positive because it’s hooked to an electronegative (electron-greedy) atom such as O or N) attracted to “lone pair” of electrons on an electronegative “acceptor” molecule. Hydrogen bonds are responsible for a lot of water’s awesomeness. They also are what holds complementary DNA (or RNA) strands together (“base pairs” are a name for these H-bonds). And H-bonds between carbonyl (C=O) & nitrogens in the peptide backbone give proteins their “secondary structure” (things like alpha helices & beta strands).

Synonyms:
hydrogen bonds, H-bonds