The theory of mind is the ability to understand that others have thoughts, beliefs, and feelings that may differ from one's own. This cognitive skill allows individuals to predict and interpret the behavior of others, facilitating social interactions. It typically develops in early childhood, around the age of 4 or 5. This concept is crucial for effective communication and empathy. It helps people navigate complex social situations by recognizing that others may have different perspectives. Autism spectrum disorder can affect the development of theory of mind, leading to challenges in social understanding and interaction.