The term "surfactant" was first used in and is a derivation of the term "surface active agent."
Surfactants are a class of chemical substances that are used to reduce the surface tension (also known as interfacial tension) between various substances, such as two liquids, a gas and a liquid, or a liquid and a solid.
Surfactants are amphiphilic substances that fall within the category of organic compounds.
It basically means that both hydrophobic and hydrophilic groups are present.
Examples:
Alkyl ether phosphates
Sodium stearate
Benzalkonium chloride
Docusate is another name for dioctyl sodium sulfosuccinate.