AI models are computer programs that aim to replicate aspects of human intelligence by making decisions, noticing patterns, and making predictions. They have user-friendly interfaces and can be used for various applications. AI models fall under the umbrella of artificial intelligence, machine learning, and deep learning. They use algorithms to recognize patterns and trends in data. There are four main types of AI models: foundation models, multimodal models, large language models, and diffusion models. Each type specializes in different areas, such as text generation, understanding and generating text, or creating images. Popular AI models include ChatGPT, vision-language models, and large language models like BERT, which are being rapidly implemented in fields such as healthcare.