Troops

In Clash of Clans, you train troops that you use to attack other bases. Here's a quick overview of all the troops in the game:
You train troops in the Barracks, and once you upgrade a Barracks you get a new troop.

Barbarian (LVL 1 Barracks):

The fearless warrior relies on his bulging muscles and striking mustache to wreak havoc in enemy villages. Release a horde of Barbarians and enjoy the mayhem!

Archer (LVL 2 Barracks):

These sharpshooters like to keep their distance on the battlefield and in life. Nothing makes them happier than single-mindedly taking down their target.

Goblin (LVL 3 Barracks):

These pesky little creatures only have eyes for one thing: LOOT! They are faster than a Spring Trap, and their hunger for resources is limitless.

Giant (LVL 4 Barracks)

These big guys may seem calm, but show them a turret or cannon and you'll see their fury unleashed! Slow yet durable, these warriors are best used to soak up hits.

Wall Breaker (LVL 5 Barracks)

Nothing warms a Wall Breaker's cold and undead heart like blowing up walls. A squad of them will make way for your ground units, and they will do it with a BANG!

Balloon (LVL 6 Barracks)

These promoted skeletons have traded in their joy of destroying walls for a joy of destroying defenses. Deploy them to take out pesky mortars and cannons! 

Wizard (LVL 7 Barracks)

The Wizard is a terrifying presence on the battlefield. Pair him up with some of his fellows and cast concentrated blasts of destruction on anything, land or sky!

Healer (LVL 8 Barracks)

This majestic creature lives to protect and aid her fellow troops. Any army is improved with her healing support, but make sure to protect her from air defenses!

Dragon (LVL 9 Barracks)

The might of the dragons is known throughout the land. This scaly terror of the skies feels no mercy and nothing will escape the fiery splashes of his breath.

P. E. K. K. A (LVL 10 Barracks)

Is P. E. K. K. A. a knight? A samurai? A robot? No one knows! P. E. K. K. A.'s armor absorbs even the mightiest of blows, but it doesn't handle electricity too well. 

*All quotes are from the Clash of Clans Barracks troop info page.

And after regular troops, you'll eventually get dark troops which you train in Dark Barracks. Dark troops are better than regular troops, but cost dark elixir which is rarer than usual gold and elixir. But you beginners out there don't get your hopes up. The dark troops, Barracks and elixir in general aren't a commodity until Town Hall 7.

Minion (LVL 1 Dark Barracks)

This terror of the skies was born out of Dark Elixir. Undetectable by the Seeking Air Mine, Minions materialize with ease, but are fragile in our world.

Hog Rider (LVL 2 Dark Barracks)

Having tamed the fierce leaping hog, the Hog Rider punishes those who hide behind their puny walls! Fueled by Dark Elixir, these warriors have never known defeat!

Valkyrie (LVL 3 Dark Barracks)

A master of the two-handed axe and granted terrible power by Dark Elixir, this glorious warrior crushes enemy troops and buildings with her whirlwind blow!

Golem (LVL 4 Dark Barracks)

The mighty Golem loves to soak up damage! When destroyed, it explodes and splits in two. The resulting Golemites have one-fifth the Golem's strength and hitpoints. 

Witch (LVL 5 Dark Barracks)

The Witch never fights alone, constantly raising dead warriors from past battles to lead her attacks. Upgraded Witches raise more skeletons at a time.

*All quotes are from the Clash of Clans Barracks troop info page.

So that's a review of all the troops that are currently in Clash of Clans. And I say currently because there are already more troops in the makes.