Artificial Intelligence (AI) encompasses a broad range of methodologies aimed at creating systems capable of performing tasks that would typically require human intelligence. An overview of Artificial Intelligence (AI) reveals a diverse and rapidly evolving field with numerous methodologies and applications. Some of the key methodologies in AI is described in detail inside the paper. These methodologies are continuously evolving, and researchers are constantly exploring new techniques and approaches to tackle complex AI problems. The choice of methodology depends on the specific task, available data, computational resources, and desired performance metrics. Also, selected case studies are described based on specific criteria that indicate Google's broader efforts in AI, which reflect the company's commitment to leveraging technology to improve various aspects of our lives, including online safety and education. This paper aims to contribute to a better understanding of AI by presenting an overview of methodologies, applications and specifically chosen case studies.