The condition for a substance to be called a resource is based on its utility and availability for human use. Resources can be broadly classified into two categories: Natural resources and Human-made resources.
Natural resources are those that occur naturally in the environment and are essential for the survival and well-being of living organisms. They can further be categorized as Renewable resources (such as sunlight, wind, water) and Non-renewable resources (such as fossil fuels, minerals).
Human-made resources, on the other hand, are created by humans for their benefit and include things like infrastructure, technology, and knowledge.
Identifying a substance as a resource requires meeting certain criteria:
1. **Utility**: The substance must have a utility or provide some kind of benefit to humans. For example, water is a resource because it is essential for drinking, irrigation, and industrial purposes.
2. **Availability**: The substance must be available in a usable form and in sufficient quantities to meet human needs. For example, sunlight is a resource because it is abundant and can be harnessed for energy production.
3. **Renewability**: In the case of natural resources, renewability plays a crucial role in determining their status as a resource. Renewable resources can be replenished over time, ensuring their availability for future generations.
4. **Sustainability**: Resources should be utilized in a sustainable manner to ensure their long-term availability and prevent depletion or degradation of the environment.
In conclusion, for a substance to be called a resource, it must have utility, be available in usable form and quantity, be renewable (in the case of natural resources), and be managed sustainably to meet the needs of present and future generations.

Resources are the atmost condition in value addition in any economy of country .
Re-again,source-usable .
for resources develop time and technology are must .
type of resources 1.natural resource .
2.land resource .
3.human resources.
4.mineral and energy resources.