seems IOS is 99% Similar to XE , so what is the difference other than Monothilic and linux kernel

[Ibrahim Jamil]

Hello

seems IOS is 99% Similar to XE , so what is the difference other than Monothilic and linux kernel 

thanks all in advance for ur answering 

[Rolf Fischer]

Hello,

IOS-XE supports multi-core CPUs.

Another advantage of having a underlying Linux OS is that you easily can run applications like WireShark or WLAN controllers on it.

Here you can find a nice document with more details: What is Cisco IOS XE?

HTH
Rolf

[Ibrahim Jamil]

thanks mate

[Ibrahim Jamil]

looks like Cisco will retired IOS soon 

[Joseph W. Doherty]

BTW, since IOS predates XE, one might say XE is 99% similar to IOS, not the converse.  ;)