Path of Exile, often referred to as PoE, is an online action role-playing game. You are playing as an exile, sent to Wraeclast, a dark place where exiles are taken. There is no gold in Path of Exile. Instead, the Orbs are used as currency, with Chaos Orbs and Exalted Orbs being the primary baseline currencies.
One unique feature of the game is that health/mana potions, are vials that stay in your health potion slot, and refill based on monster kills, their max dosage is set by the quality of potion. So you have this pool of health available to you, but it’s limited by how many enemies you are slashing your way through. The potions also act over time, rather than instantaneously.