What are soft materials used for?

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I did not understand well ?

Soft materials are important in a wide range of technological applications. They may appear as structural and packaging materials, foams and adhesives, detergents and cosmetics, paints, food additives, lubricants and fuel additives, rubber in tires, etc.

because the light is a great source of energy for the plants to survive. (i hope this )

substitution is the answer in this case