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Data annotation is the core service of adding semantic labels to raw data, transforming it into structured information that AI systems can recognize and process. Covering a wide range of modalities, including images, text, and voice, data annotation plays a crucial role in AI training applications such as autonomous driving, intelligent customer service, and medical imaging. By providing precise annotation, we deliver high-quality training data that enhances the accuracy of algorithms and the effectiveness of their implementation, serving as a critical enabler for businesses to build intelligent applications.