"Aprotic polar solvent" refers to a type of solvent that is polar but lacks the ability to donate or accept protons (H+ ions). It is a solvent that does not have an available hydrogen atom bonded to an electronegative atom such as oxygen or nitrogen, which would allow it to participate in hydrogen bonding. As a result, aprotic polar solvents have unique properties and are often used in chemical reactions and industrial processes. Examples of aprotic polar solvents include dimethyl sulfoxide (DMSO), acetone, acetonitrile, and tetrahydrofuran (THF).