What's Standardization, and why do it? Surprisingly, there are very few resources online (outside of obscure lab pages) that explain exactly what standardization is (not even Wikipedia!). The context is the phrase standardize the titrant for a titration. Does this mean you titrate it with a known solution?
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.