The economic potentional for the algae industry is seemingly limitless. The range of products that are obtained from macroalgae and that we use in our daily lives suggests that, at least in the developed world, we cannot live through a single day without using something that at least contains some macroalgal-derived constituents or something that has required the use of macroalgal products in its manufacturing process. With applications as diverse as food for human consumption (e.g., the wrap on a sashimi roll), as a food additive (e.g., to improve mouthfeel in yogurt), in cosmetics (facial scrubs and soaps) through to screen printing (materials for shirts, skirts, and bed sheets) and even in the production of welding rods that have been used in assembling the steel frames of household furniture (to ensure an even burn and smooth join) the uses are limitless. This chapter explores these uses.