Minecraft is constantly being worked on by the developer studio Mojang, so updates to the Game are frequently released.
Updates for the game may include new/removed/tweaked features such as: blocks, items, entities, code and more.
If you choose to play Minecraft using Offline Mode, you will not recieve new updates.
All things in these updates are found here:Minecraft Updates Changelog
Note: some Minecraft versions may not be listed here. If you notice an update is not mentioned (or is mentioned incorrectly) feel free to edit the article.
IMPORTANT NOTE: The bugfixes for beta and alpha were only introduced to official minecraft 2010-2012; door sounds and other things fixed CAN NOT BE PLAYED IN MINECRAFT WITHOUT 3RD PARTY SYSTEMS OR MODS!!!
Classic (0.3 - 0.21) (needs to be clarified as of the new launcher time machine)
Infdev (0.56 to 0.89) (needs to be clarified)
Survival Test (0.26 to Alpha 1.1) (needs to be clarified)
Alpha RD 2009-early 2010
Alpha 1.0.1 The first stage!; Redstone! Game officaly released!
Alpha 1.2.0 - The Holoween Update!
Alpha 1.2.1_01 Major retexture of items and blocks!
End of known updates for alpha
Beta 1.7 Retexture of cobblestone! Pistons!
Beta 1.8.1pre2 Beta 1.8.1pre3
Beta 1.8.1 The Adventure Update!
Beta 1.8.2 Bow animation fixed along with sword perrying action being delayed
Beta 1.9.2 New door noise! (Covers Iron and Wooden Door)
Beta 1.10 Needs clarification
The Minecraft Stage
Update 1.0.0 The end is nigh!
Update 1.2.1 Jungles!
Update 1.2.3 Ocelots!
Update 1.4.2 Pretty Scary Update!
Update 1.5.1 The Redstone Update!
Update 1.6.1 The Horse Update!
Update 1.7.1 The World/Biome Update/The update that changed the world!