What is interlacing as opposed to progressive scan?

[rainstel]

As title. What does interlacing do in terms of picture quality and how does it differ from progressive scan, and why would you use it instead of prog scan?
thanks.

 

[neilmcl]

Have a read of this: http://www.hometheaterhifi.com/volume_7_4/dvd-benchmark-part-5-progressive-10-2000.html

Also a quick google of "interlaced vs progressive" will give you all the info you'll ever need.