Quantum error correction is a research field and set of techniques dedicated to protecting quantum information from the detrimental effects of environmental noise and imperfections. It investigates encoding strategies and correction protocols essential for enabling reliable quantum computation. This approach involves encoding fragile quantum states into larger, highly entangled systems, enabling the detection of error syndromes without collapsing the encoded information. By identifying the type and location of errors through these syndromes, appropriate recovery operations can be applied. Quantum error correction is fundamental to overcoming the inherent fragility of quantum systems and is considered indispensable for building fault-tolerant quantum computers capable of performing complex algorithms.