[IBIS] What is IBIS ?

Hi Friends,
                     I have read few notes on IBIS but did not get the
feeling what exactly is IBIS and why this is required. Can somebody please
explain it to me in a simple language?

Thanking you,

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.Mithlesh Shrivas (Core-id:R64034).......
.Design Engineer.........................
.Freescale Semiconductor India Pvt. Ltd..
.Motorola Excellence Centre..............
.415/2 Mehrauli-Gurgaon Road, Sector-14..
.Gurgaon 122001 (Haryana)................
.Mobile: +91-9811824928..................
.Office: +91-124-2303212 Ext.1321........
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.___________________
.POPI Classification:
.===================
.Unless specified this is a General Business Information.
.[ ] Freescale Internal Use Only
.[ ] Freescale Confidential Proprietary
.
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