Army
Army Buildings are a very important things in Clash of Clans. These buildings train troops (see on troops page), hold troops and upgrade troops so they can become more powerful.
Army Camp
Army Camps are simply camps which hold troops. The more you upgrade your army camps with gold, the more troops they can hold which can be very handy.
Barracks
Barracks are very important buildings when it comes to troops. They basically train troops. Every time you upgrade your barracks, you unlock a new warrior to use. Usually the better the troop your training, the longer and more expensive it is.
Dark Barracks
Dark Barracks are exactly the same as the normal barracks except these troops are a little bit different... These troops use Dark Elixir instead of normal Elixir. You need to be at a a lot higher level to receive Dark Elixir and buy these Barracks.
Laboratory
Here at Clash of Clans Wiki when think that the laboratory is the most important when your building an army. The laboratory is a very powerful tool that every person needs to use to become an elite Clash of Clans player. The laboratory gives you the ability to upgrade your troops to become more powerful than they already are! Buts its not all that cheap! The more you upgrade your laboratory, the powerful your troops can become.