Artificial intelligence (AI) is increasingly being used to address critical societal issues, yet its opaque nature often leads to significant trust and reliability challenges. This opacity, especially in large language models (LLMs) like GPT-4 and LLaMA, can result in undetected errors or credibility damage when users identify inaccuracies. Model observability emerges as a solution, allowing for validation and monitoring of machine learning (ML) models by tracking performance and diagnosing issues through techniques like explainable AI (XAI). By maintaining continuous logs of model behavior, observability aids in regulatory compliance and fosters customer trust by ensuring unbiased and consistent model behavior. In complex AI domains like natural language processing and computer vision, observability adapts with advanced techniques to address specific issues such as data drift, hallucinations, and image occlusion. Despite challenges like increasing model complexity and privacy concerns, observability remains crucial for optimizing AI performance, improving productivity, and ensuring compliance, with future trends focusing on more user-friendly and human-centric explainability methods.