from the NIV website:
“The NIV was created and is maintained with the mandate to accurately and faithfully translate the original Greek, Hebrew and Aramaic biblical texts into clearly understandable English.
The NIV is the most widely accepted contemporary Bible translation today among evangelicals. More people today buy the NIV Bible than any other English-language translation.”
The NIV, like most English Bible versions, has been revised at various times. The most recent NIV revision was published in 2011.