Yes, all you need to do is run back to the entrance of the instance and walk through the portal again. You will automatically be resurrected after stepping through the instance portal.

There are more than a hundred micro dungeons throughout the world of Azeroth, ranging in relative size from small to quite big. Micro-dungeon locations will include tombs, haunted mines, ice caves, and sunken ships to name a few. The transition into and out of these dungeons will be seamless, and you'll be able to run into other players anywhere along the way.

World Dungeons, which are grander in scale than Micro Dungeons, are specifically designed for more epic encounters. World dungeons include places such as Blackwing Lair, the Westfall Deadmines, and the Scarlet Monastery. All these locations have common areas where players can meet up and fight together.

But deeper in the dungeons are areas set up specifically for more private group (or sometimes guild) adventures. These private dungeon areas, called Instance Zones, allow you and a group of friends to have a more personal experience exploring, adventuring, or completing quests in your own private dungeon.

You also have the ability to invite others into your Instance Zone to join you. This relieves many of the camping, kill-stealing, and farming issues that MMORPGs sometimes face. The monsters in Instance Zones are typically more powerful, making groups of players work together to defeat them, but with greater dangers come greater rewards!

An instance zone refers to special zones that only you and your group are allowed to enter and explore.

Every instance has a maximum number of players that can enter it at one time; some allowing full raid groups and some limiting you to 5 man parties. If you are in a raid group, no enemies will drop quest related items and you will not get credit for killing enemies within the instance for a quest. The exceptions to this rule are raid quests which are designed to be done by over five characters at once.