Final answer:
Flow states are characterized by intense concentration, a sense of personal control, and being fully immersed in a task. They occur when the challenge matches the individual's skill level.
Step-by-step explanation:
Flow states, as described by Csikszentmihalyi, are characterized by intense concentration, a sense of personal control, and a feeling of being fully immersed in a task. They occur when the challenge of the task matches the individual's skill level. Novices may find the same task stressful and frustrating, while individuals with proficiency at the task experience pleasure and fulfillment.