This lesson lays the groundwork for understanding Artificial Intelligence (AI) by delving into its essential components. We will begin by establishing a clear definition of AI and tracing its significant historical milestones, illustrating how the field has evolved from theoretical concepts to a pervasive technological force. Subsequently, we will explore the primary branches of AI, including Machine Learning (ML), Deep Learning (DL), Natural Language Processing (NLP), and Computer Vision (CV), providing an overview of their distinct methodologies and applications. Finally, we will define key concepts and terminology that are fundamental to comprehending the mechanics and potential of AI, equipping you with the necessary vocabulary to navigate this transformative domain.