What are the main differences between RHEL4 & RHEL5 and RHEL 6

#########RHEL4 and RHEL 5 ########################
XEN, YUM and improved SELinux
all the features updated with better options
Better GUI support then RHEL4
YUM over RPM package management
IPTables and SELinux for more secure environment
ext2 & ext3 file system
In RHEL 4 SELinux Block only 13 services, But on RHEL 5
SElinux Block 80 services
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Difference between RHEL 4 and RHEL 5 :
1) In RHEL 4 SELinux Block only 13 services, But on RHEL 5 SElinux Block 80 services.

2) RHEL 4 have ext2 filesystem, but RHEL 5 we have ext3 filesystem that support Journal.

3) RHEL 4 have no virtualization Feature, but in RHEL 5 we have virtualization with Hypervisor-V.

4) In RHEL 4 we have no Yum, But in RHEL 5 we have Yum available.

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