Well all of the otehr members will give you definition of CRO but i am giving you some description about it.
Conversion rate optimization is the process of scientifically changing elements of your website in an attempt to make your website more effective. These elements include, web pages, landing pages, images, words and your site are limited to procedures used can not, or just take away what does not. Conversion rate optimization, because it is powerful, without increasing the number of visitors to your site increases your website conversion. Increase the overall revenue increase of total conversion, depending on the specific definition of what your company should consider a conversion.