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The Corruption is a biome that forms during the creation of a World at a minimum of one (generally up to three) random location.

The Corruption is recognizable by its background with violet mountains, dead trees, purple grass and darker lighting than other biomes, and is the only biome in which one can find Chasms, Ebonstone, Shadow Orbs and Vile Mushrooms.

Initially, the Corruption can spread to regular grass from corrupted grass so long as the blocks are adjacent. Corrupted grass will also occasionally produce thorns that deal 10 damage and grow indefinitely so long as they are within four blocks of another block.

The monsters found in this biome at any time of day are relatively strong, and are thus a good reason to avoid the Corruption at the beginning of the game.

Hard Mode Changes

After the Wall of Flesh is defeated in a World, the Corruption starts to spread at twice the normal speed, gains the ability to spread over sand and stone as well as turning mud into corrupted grass, and becomes able to spread across gaps of "incorruptible" material up to two blocks long. Additionally, Sunflowers will no longer stop the spread of the Corruption, rather breaking into collectible items upon being reached. Finally, all monsters slain in the Underground Corruption will have a chance of dropping a Soul of Night.

Corruption Prevention

There are numerous ways to prevent the Corruption, such as separating your house/base from the rest of the map with a 3-block wide buffer. You do not need to completely seal off your base, only separate the parts of your base from contact with the rest of the map that could become Corrupted.

Another way is to cure the Corruption before defeating the Wall of Flesh, eliminating the preventatives needed to protect your base. However this is a rather hard alternative as, although it has the best results, it is time- and money-wasting, for little or no profit. Also, as the Hardmode spawns more Corruption, the original biome is not as worth clearing.

Another method is to spread the Hallow on the both sides of your house, as neither the Corruption nor the Hallow can spread across the other.

A quick (depends on size) but expensive way to clear the Corruption is by simply blowing it up (with any kind of explosive save Grenades). However, this is very expensive will leave a very big hole.

Artificial Corruption

An artificial Corruption can be created by planting Corrupt Seeds in dirt, and/or by adding around 250 blocks of Ebonstone. This will spawn all monsters from the Corruption, and can be used as a place to summon the Eater of Worlds. Placing any Artificial Corruption close to your home is dangerous as Devourers will spawn and attack you.

Items/Monsters that Spread Corruption

Corrupt Seeds
Thorns

Hard Mode

Ebonstone (any number of blocks)
Corrupter (Vile Spit)

Notes

You can remove corrupt areas by using Purification Powder or turn them into Hallowed areas with Holy Water.
If you talk to the Dryad and click status she will tell you what percentage of your world is Corrupt and Hallowed
If the thorns touch non-corrupt dirt or trees, they will become corrupt, and further spread The Corruption.
The Corruption or Artificial Corruption must be used as the place to fight the Eater of Worlds.
Where The Corruption meets another biome its possible for monsters from both biomes to spawn.
The Corruption at night is quite dark, therefore remember to bring some form of light.
The Corruption cannot spread to snow blocks; therefore the Hallow cannot spread through snow biomes.
Corrupter's Vile spit attack will also spread the corruption to other blocks.
The Hallow is thought to be the opposite of The Corruption.
Wood is a cheap but effective material for containing the Corruption or the Hallow

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Wikia

The Corruption

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