What is the Difference between ECC and EWM

Hai Genius,

I'm just new to EWM and I like to be strong in basics of ECC and EWM.

Can anyone help me by explaining what is ECC and what is EWM?

Difference and Relation between ECC and EWM?

How ECC and EWM is linked?

And some importance about ECC and EWM?

It will be very helpful for me to understand EWM easily.....

Regards,

Jayanthi.