What does the term "smear" mean in PCR ? - (Mar/05/2006 )

I had my first PCR experiment last week. I don't know many terms about it.
Please tell me the meaning of smear in PCR. Thanks!

tssssssssssss.... 2 seconds googling... with "smear PCR" as keywords in "images panel.
http://images.google.fr/imgres?imgurl=http...cial_s%26sa%3DG

I'sorry that I have some problems with English to surfing the web.
Thanks for your answer!
But I really wnat to know is that why DNA product show in this way of smear ?

well when you have non specific annealing, primers are fixed aberrantely on template and on products. Finally you have quite all length fragment produced en that drive a smear.

In which language do you prefer talking?
cause i'm confused... you were able to type "with English to surfing the web" on bioforum and find this site.So you were able to check some references?...