Here is the Shaman, one of the classes defined by Blizzard® as the most versatile in this game, its versatility comparable to that of the Druid. It's one of those characters who has the ability to be offensive on two fronts: Attack spells at a distance, much like a Mage. Melee attacks, in the manner of a Warrior. The Shaman is also a very important healing support in a proper raid group, thanks to their totems.
The Totems: Speaking of which, let's talk about these totems — there lies all the complexity of playing a Shaman. First and foremost, the Shaman is the master of the elements; they communicate with nature and use it to their advantage. There are four types of totems, just like the four elements around us: air, fire, earth, and water. These four elements determine the number of totems a Shaman can place simultaneously. Thanks to these totems, the Shaman can enhance various aspects of both themselves and their group. These totems are either supportive or enhancing in nature (e.g., the Healing Totem for support and the Air Totem for enhancement). It’s important to know how to create the best possible combination according to the situation, knowing that only four of them can be active at once from the wide array available to the player.
PVE: The main role of the Shaman in a PVE instance, at the risk of inviting some criticism, is to cast healing spells. They are effective in supporting healing thanks to a buff* they can apply when performing a critical heal, granting their target +25% armor, similar to a Priest. Additionally, the Shaman has the enormous advantage of being the greatest source of mana regeneration for a group when specialized appropriately for PVE instances, again thanks to their totems which provide this improvement. The Shaman has three healing spells at their disposal: Lesser Healing Wave ("Flash Heal," 1.5s cast time), Healing Wave (3s cast time), and Chain Heal (2.5s cast time), which heals up to three people at once.
PVP: Many Rank 14 players have emerged with a Shaman under their control, and for good reason. The Shaman offers two types of combat that can be combined to maximize damage output over time. The Shaman has the ability to fight in melee while remaining highly resilient thanks to their mail armor, which absorbs a significant portion of the damage they might take. A small amount of weapon buffs are available to them, such as Windfury, which grants a 20% chance for two additional attacks and a bonus to attack power. Finally, their magical damage provides either a complement to their physical damage or serves as their primary damage source depending on their specialization. Shamans specializing in elemental magic choose security through distance, allowing them to cast powerful and weakening spells. Once again, totems are a major asset and often overlooked by enemies in combat.
Conclusion: Yes, you've understood it — the Shaman is a jack-of-all-trades class that doesn't excel in any one function but cannot replace classes like the Warrior, Mage, or Priest. However, their versatility makes them autonomous in PvP* and useful in PVE due to their totems.