Hit Points

Health Points (HP) are a standard in most games as a way of gauging how much damage a person can withstand. Once this parameter reaches zero, the character is either rendered incapacitated or dead, depending on the rules of the game.

In Sword Art Online
In the official version of Sword Art Online, health points are of dire importance, since 10 seconds after a player's HP bar reaches 0, the player's character would be destroyed and the player controlling the character would be killed by the NerveGear frying the player's brain. Health points in the game can be restored by using Healing Potions or Healing Crystals. HP in the game is displayed both in numbers (current HP/maximum HP) and a visual coloured bar, that changes from green to yellow (50% or below maximum HP) to red as the player's HP decreases. The maximum value of a player's HP value can be increased by leveling up.