What substance is extracted from red algae, which is then used by people to make jelly and confectionery?

People use kelp and red algae to create a vegetable substitute for gelatin. This is agar agar. Regular gelatin is of animal origin. It cannot always be used for confectionery purposes. But agar-agar is widely used to create marshmallows, marmalade, various desserts, puddings and other products. It is not an expensive and non-harmful gelatin substitute. It can be found in any store. Agar-agar gained popularity due to the fact that it does not change the taste of the product, but at the same time it is not inferior to gelatin.