Value, usability and technology are the factors which help us to utilise resources.
Resources like sunlight, water, buses, trains and paper have value as they satisfy our wants. Thus, all resources have value.
It is because these resources have value, we use them. For example, if we want to travel from Mumbai to Kerala, we will either travel by train or plane. Hence, it is the utility or usability of a material or commodity which makes it a resource.
Technology further refine the resources and increases their value. For example, iron becomes useful only when it is extracted from its ore. Therefore, technology enhances the value and utility of the resources.