Pop filters are just among the basic device in any vocal work. A microphone pop filter is basically a wind screen that is put in in the middle of the mic and the vocalist. It is a crucial piece of [device|equipment} because of its potential to eliminate Ps, Bs, Ts and Ds from popping. http://auphonix.com/bestfilter
Popping is an unpleasant sound produced when saying the mentioned plosives and can let your vocals sound low quality. A small piece of device such as this can set you back a little but will go a long way in cutting time and money for editing or redoing your work.
