A distraction is anything that is competing for your attention and unrelated to the work you're doing at the moment.
- Visual distraction: If you're working in one application and you see a notification pop up, that is a visual distraction.
- Auditory distraction: Anything you can hear, like people screaming, for example. Use noise cancellation headphones.
- Kinesthetic distraction: If your chair is uncomfortable, or the air too hot, it counts as a distraction.