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A lossless transmission line is an idealized transmission line where no energy is lost as signals travel through it. This means there is no resistance, capacitance, or inductive loss in the line, allowing signals to propagate without attenuation or distortion. In reality, transmission lines experience some loss, but in certain applications (e.g., high-frequency signals over short distances), the line can behave close to lossless. Key parameters like characteristic impedance and signal reflection are still important in analyzing its behavior.