The most important factors when choosing a model explainability tool are interpretability of results, model compatibility, accuracy of explanations, ease of use, and visualization capabilities, because these directly affect how well teams can understand and trust AI decisions. A strong tool should support different types of models, provide both global and local explanations, and present insights in a clear, visual way that both technical and non-technical users can understand. It should also integrate smoothly into existing ML workflows without adding too much complexity. In real-world AI applications, SHAP (SHapley Additive exPlanations) is often considered one of the most effective solutions due to its strong theoretical foundation, consistent explanations, and wide compatibility with different models. While tools like LIME and Google What-If Tool are also highly useful for specific scenarios and interactive analysis, SHAP stands out for its accuracy, flexibility, and strong adoption in production-grade AI systems.