A Concept album is an album which tells a story. All the songs are set on the same idea or writing and represent "Chapters", like a book.

Concept albums have started to really grow on me. I've listened to Protest The Hero's "Kezia" and Green Day's "American Idiot". I'm currently listening to Alesana's "Emptiness". What other good concept albums are out there that you'd like to share with me?
Scenes from a memory, dream theater... Indeed
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Nostradamus - Judas Priest
Crimson Idol - WASP
2012 - Rush --- only first half is concept but really, really worth listening to.
Quote by Joeslash
Scenes from a memory, dream theater... Indeed

I have to second this. Brilliant album.
Any King Diamond album > Everything posted above and after this post
Mastodon - Blood Mountain
Protest The Hero - Fortress
Thrice - The Alchemy Index
Uneven Structure - Februus
Vildhjarta - Masstaden
The Contortionist - Exoplanet
The Faceless - Planetary Duality
Gojira - From Mars To Sirius(might be wrong bout it being a concept album, but great album nonetheless)

Almost Forgot
HORSE The Band - Pizza EP
Last edited by oodlesofbrutals at Dec 23, 2011,
ALice Cooper - The Last Temptation, Along Came a Spider, Welcome to My Nightmare, Welcome 2 My Nightmare, Goes to Hell and From the Inside which is kind of a concept album as al the songs a based on people he met in a mental institution when he was a patient.
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Hüsker Dü - Zen Arcade
The Who - Tommy, Quadrophenia
Defeater - Travels, Lost Ground, Empty Days & Sleepless Nights
Neutral Milk Hotel - In The Aeroplane Over The Sea
Minutemen - Double Nickels On The Dime
Nine Inch Nails - The Downward Spiral
The Mars Volta - De-Loused In The Comatorium, Frances The Mute, The Bedlam In Goliath
La Dispute - Wildlife
Fucked Up - David Comes To Life
The Antlers - Hospice
David Bowie - The Rise And Fall Of Ziggy Stardust And The Spiders From Mars
Quote by IommiPage
Minutemen - Double Nickels On The Dime

That's not a concept album, gtfo!

However, everyone should listen to it anyway, 'cuz it's one of da best.
Quote by JoeslashF
Scenes from a memory, dream theater... Indeed

yes. I have this as well. It's easily one of the best albums I've ever heard in my life.

...one of...

Quote by Skuzzmo
2012 - Rush --- only first half is concept but really, really worth listening to.

yes. Haven't listened to it yet, but heard fantastic things about it.