Date: 2 March 2016.
Grid based design utilises columns in browswer, to give better structure to the page layout. Usually there are 12 colums, each taking up 8.33% of the page width. This is because 12 is easily divisible by 2, 3 and 4.
It makes sense to have a webpage adapt to the viewing port of the device being used. CSS can now be adapted such that it responds to the device automatically, making easy viewing for the visitor.
I'm a little confused about this question.
Grid based design utilises columns in browswer, to give better structure to the page layout.