This presentation offers an in-depth exploration of Large Language Models (LLMs), the powerful engines behind modern Generative AI. We'll break down the architecture of LLMs, explain how they process and generate human-like text, and explore their far-reaching capabilities—from natural language understanding to content creation. You will gain insight into the how these machines think, mechanics of these models, their training methods, and how they achieve their impressive results. We will also explore the potential of LLMs beyond text generation, focusing on their emerging impact on Computer-Aided Design (CAD). Alongside these benefits, we'll examine the pitfalls of LLMs, including issues like hallucination, bias, overfitting, and ethical dilemmas. This session will equip you with a comprehensive understanding of LLMs, their transformative power in generative AI, and their implications for the future of CAD and design innovation.