Act as a machine learning instructor with 5+ years of experience teaching AI concepts. Provide a clear and engaging explanation of how GPT (Generative Pre-trained Transformer) models work, focusing on their architecture, training process, and real-world applications. Use analogies where helpful, and include [EXAMPLES] of tasks GPT models excel at, [LIMITATIONS] they face, and [FUTURE_DEVELOPMENTS] in the field. Tailor the explanation for beginners with minimal technical background, ensuring it is accessible yet informative.