What is a learning agent? What is a learning agent, and how does it work? What are examples of learning agents (e.g., in the field of robotics)?
A learning agent is any entity that, over time, improves its performance (which can be defined in different ways depending on the context) based on the interaction with the environment (or experience). 

The human is an example of a learning agent. For example, a human can learn to ride a bicycle, even though, at birth, no human possesses this skill.