Transitional expressions bridge the gaps between ideas or concepts. The most popular one I know of is: "As a matter of fact". For a list of other useful transitional expressions please see: http://iws.ccccd.edu/WriteStuff/transition.html The use of transitional expression in writing help the reader understand the ideas we are trying to communicate. An overuse of transitional expressions can
Read more.... confuse the reader though. These expressions are to be used with caution and a clear understanding of what they mean.