Intelligent agents in AI are software entities designed to act on behalf of humans with some degree of autonomy. Such agents interact with their environment by sensing its status and employing their knowledge to carry out operations that help them achieve their goals. Intelligent agents possess distinctive properties such as adaptability, reactivity, proactivity, and sociability. They can collaborate or compete with each other, aiming to achieve personal or shared objectives. The applications of agents vary in scale, ranging from personal assistants and conversational systems to large-scale, intricate, and mission-critical systems such as autonomous vehicles or search and rescue drones. The research on intelligent agents focuses on inventing innovative agent models, frameworks, and techniques to improve their capabilities.