1. **State the problem:** Find the volume of a rectangular prism with dimensions 6 units wide, 8 units tall, and 4 units deep. 2. **Formula:** The volume $V$ of a rectangular prism is given by the formula: $$V = \text{length} \times \text{width} \times \text{height}$$ 3. **Apply the formula:** Substitute the given dimensions: $$V = 6 \times 8 \times 4$$ 4. **Calculate step-by-step:** $$6 \times 8 = 48$$ $$48 \times 4 = 192$$ 5. **Final answer:** The volume of the rectangular prism is $$\boxed{192}$$ cubic units. This means the prism can hold 192 unit cubes inside it.