Any substance, living being, or service that has a utility (i.e. can help us in any possible way) is known as a resource. ex. - books. stationery material,clothers, utensils, furniture, etc.
resources may be natural.
natural resources are those taken from the nature. they are used without modifying them, i.e. in the same form as they exist in. ex. - rivers, lakes, air, soil, minerals, etc.
hope you find it useful. happy to help. :))