Artificial intelligence (AI) is definitely one of the most important innovations after the internet. In recent years, AI has emerged as an integral part of our lives and changing the way we live and work, creating value in every domain of our lives. With its inherent ability to follow human instructions (read algorithm) and efficiently perform tasks that would need significant human time and effort, AI has revolutionized numerous sectors, from health care to finance, and its impact continues to grow as the technology advances. The present chapter provides basic understanding of AI and its building blocks, making it easier for readers from different backgrounds to understand the frequently used terminologies in this book.