Multivariate Testing (Experimental Design) vs A/B Testing

You may have heard of A/B Testing and Multivariable Testing (Experimental Design) in terms of website optimization to maximize conversions among other goals. What are these testing regimens? When should you use them? A/B testing is just that — testing one configured webpage (A) against another (B) and analyzing which is best. Multivariate testing (MVT) [...]