Focus/Flow: focus refers to the ability to direct and maintain one's attention on a particular task, activity or stimulus. Whereas flow is an advanced and effortless state of focus.
Flow arises when one’s skills are fully utilized yet equal to the demands of the task, intrinsic motivation is at a peak, one loses self-consciousness and temporal awareness, and one has a sense of total control, effortlessness, and complete concentration on the immediate situation (the here and now).
Several decades of research has confirmed that flow is associated with optimal performance and with mental health benefits, including a better mood and sense of meaningfulness.
https://dictionary.apa.org/flow
https://www.psychologytoday.com/us/blog/thinking-about-kids/202510/the-joy-of-losing-yourself-flow-fuels-focus-and-fulfillment
https://www.psychology-lexicon.com/cms/glossary/39-glossary-f/10074-focus.html