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Water flows in the river and finally drains into the ocean without any use. We build a dam across it. Water is blocked by the dam and hence water pressure rises. The high pressure water can be used to generate electricity.
Similarly, the current (electron) flows from positive to negative terminal of a battery when they are connected. Now, insert a resistor in the path of current. The resistor resists the flow of electrons and builds up electrical pressure(voltage , potential)across it. It is according to ohms law V = IR. This electrical voltage can be extracted from resistor and can be used for any purpose.
So resistors are like dams that controls the flow of current and builds up required electrical potential. There are no circuits without resistors.
