A Low-Density Parity-Check (LDPC) code is a type of error-correcting code that is widely used in digital communications and data storage. LDPC codes are characterized by a sparse parity-check matrix, which results in low decoding complexity while still providing good error correction performance. LDPC codes are known for their superior performance close to the Shannon limit, which is theoretically the maximum achievable data rate for a given channel. Research in LDPC codes focuses on improving decoding algorithms, design techniques, and code construction methods to enhance their error correction capabilities and practical implementations in various communication systems.