Agarose is a polysaccharide compound extracted from seaweed. It is primarily used in molecular biology and biochemistry as a gel medium for electrophoresis. Synonyms for agarose include agar, a substance with similar properties that is also derived from seaweed, and gellan gum, a microbial culture-derived gelling agent. Additionally, carrageenan can also function as a gelling agent and is sometimes used as a substitute for agarose. While these compounds differ in structure and origin, they share the property of forming stable gels at low concentrations, which makes them useful in a broad range of applications in science and industry.