The Default Mode Network (DMN) is a group of brain regions that are active when a person is not focused on the outside world. It is involved in processes such as daydreaming, recalling memories, and thinking about the future. The DMN helps with self-referential thoughts and social cognition, allowing individuals to reflect on their own experiences and understand others. Research has shown that the DMN is less active during tasks requiring attention and focus, such as problem-solving or engaging with the environment. This network includes areas like the medial prefrontal cortex, posterior cingulate cortex, and angular gyrus, which work together to support internal thought processes.