Health represents your physical well-being. When you take damage from an ability or attack, then the amount of health you have will deplete. Should you fall below 25% of your maximum health, then you will enter a state of shock where it will become difficult to move long distances for a short while. And of course, should your health reach 0, you will die. Later in this section of help files, in HELP RECOVERY, you will read about how to recover lost health.