Filters Qn

[nEkOgOtCh]

Not sure if anybody has posted this qn before Just trying.

What's the difference between Warm-up filters (81A, 81B, etc), Polarizer, UV filters and B&W filters?

Which would be useful for travel photography?

Thanks in advance.

 

[Kit]

http://www.photographytips.com/page.cfm/33

I believe you can find your answers here.