What is jelly like substance from algae?

The jelly-like substance produced by some types of algae is called agar. It is made up of long chains of sugar molecules called agarose. Agar is commonly used in laboratory and medical settings as a gelling agent for cultures, as well as in food production as a thickener or stabilizer. It is also used in the production of certain cosmetic and pharmaceutical products. The species of algae that produce agar are mainly found in marine environments, particularly in Asia. The properties of agar can vary depending on the specific species of algae it is derived from, as well as the conditions in which it is harvested and processed.