What is the difference between versions of Windows Server 2008?

There are several versions of Windows Server 2008 that are listed first to put:

Windows Server Standards Edition (Standard Edition)

Windows Server Enterprise Edition (Corporate Edition)

Windows Server Datacenter Edition (Data Center Edition)

Windows Web server (Web application server)

Windows Server for ltanium-based Systems (Itanium)

2. Windows Server Standards Edition (Standard Edition)

   Characteristics:

   For SMBs, supporting Windows Server 2008 features in the environment is the longest deployed version, unlike other versions a, 32-bit versions support up to 4GB of memory, support for up to 4 CPU B, 64-bit versions in SMP configurations up to 32GB memory Supports up to 4 CPU C in SMP configurations, supports Network Load Balancing clusters, but does not support failover clustering

4. Windows Server Enterprise Edition (Corporate Edition)

   Characteristics:

   For large enterprises, on servers running SQL Server Enterprise Edition and Exchang Server 2007 applications, this version A, failover cluster B, AD Federation C, and 32-bit editions support up to 64GB of memory. Supports up to 8 CPU D, 64-bit versions with up to 2TB of memory in SMP configurations and up to 8 CPUs in SMP configurations

6. Windows Server Datacenter Edition (Data Center Edition)

   Characteristics:

   Supports up to 64GB of memory for large-scale enterprise A, 32-bit versions, supports up to 32 CPU B, 64-bit versions in SMP configurations up to 2TB memory, supports up to 64 CPU C in SMP configurations, supports failover clustering and ADFS D, unlimited virtual image rights

8. Windows Web server (Web application server)

   Characteristics:

   A, 32-bit version designed specifically for Web application servers supports up to 4GB of memory, supports up to 4 CPU B, 64-bit versions in SMP configurations up to 4GB memory, supports up to 4 CPU C in SMP configurations, supports Network Load Balancing clusters

10. Windows Server Croe (Server Core)

    Characteristics:

    The Server Core is a lite version of a version of the Windows Server 2008 step above. No desktop, commands to manage like Linux or DOS command line, no interface

12. Windows Server for ltanium-based Systems (Itanium)

    Characteristics:

    For the Itanium processor system, this system is not commonly used by our people, only know that the system on the line, specifically do not introduce

What is the difference between versions of Windows Server 2008?