Polar codes is a class of error-correcting codes constructed based on the principle of channel polarization, a technique that transforms a set of independent, identical channels into a mixture of channels that are either nearly noiseless or nearly completely noisy. This research concept investigates the fundamental limits of reliable data transmission over noisy channels by concentrating information onto the high-quality (noiseless) polarized channels, representing a significant theoretical breakthrough as the first explicitly constructible codes achieving the symmetric capacity of a wide class of memoryless channels.