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Impedance, denoted Z, is an expression of the opposition that an electronic component, circuit, or system offers to alternating and/or direct electric current.Impedance is a vector (two-dimensional)quantity consisting of two independent scalar (one-dimensional) phenomena: resistance and reactance.
But what does it mean to say that the impedance of the cable between the VCR and TV is 75 ohms? Well, first, it doesn't mean that the cable itself presents a 75 ohm load. If it did, the total load would now be 150 ohms, and you'd have an impedance mismatch.