What's Standardization, and why do it?
Imagine that you need to titrate the sample S with a solution of the reagent R. 

Unfortunately, R isn't available as a stock solution and maybe not even in solid form. All you have is it's precursor P and a recipe for the reaction $\ce{P + X + Y -&gt; R}$. You never know how good that works out.

At this point, titration of S with R doesn't make any sense - unless you can determine the concentration of R! 

Here, a stock solution with an exact concentration of the helper H, maybe in a sealed vial from a commerical source comes into play. 

The titration of R with H to give the exact concentration of the solution of R is the standardization of the titrant.