Are the similar to EV'S or different also?
IVs stand for individual values. The are preset numbers that determine your pokemon's stats. They can be as high as 31, and determine the type of hidden power when you use it. Here's something else if you want to see more in depth:
each stat can range from 0-31, the higher the number, the higher your pokemon's potential max stat. If you want to calculate your pokemon's IVs, go here.