Please explain the difference between row and page compression
This is a good reference and explanation for row v page (no pun intended) compression:
http://blogs.lessthandot.com/index.php/datamgmt/dbprogramming/how-sql-server-data-compression/

In short though, page compression encompasses the algorithms contained with row level compression and then also covers Prefix compression and Dictionary compression.  Prefix and dictionary compression finds patterns in the data and replaces them with smaller values.  During decompression it will do the reverse and restore the data to its original values.

Row level makes easier compression decisions, like reducing metadata, and removing unused space, like the letter 'Y' stored in a CHAR(1000).

The article referenced explains this in much greater detail.