It is anything that you perceive with your senses that distracts you, carries you away, causes you to want it, crave it and then cling to it. You are then trapped. It will be difficult, if not impossible, to break free. It is this attachment to whatever it is that brings you the most suffering. Why? Because there are always detrimental conditions that come with all attachments.
There is freedom in letting go, not holding on. That freedom naturally comes with a deep sense of peace, along with clarity of mind. This clarity of mind brings insights. Insights lead to great wisdom, and more natural pleasure than any craving-attachment could possibly manage.
See reality as reality, illusion as illusion and you will never suffer!