or the inflicting or receiving of pain such as from whipping, pinching, bitiing (hopefully without any blood drawn), etc.

B&D is bondage and discipline which involves physically tying up one party (the sub) with cuffs, ropes, chains, etc.  Discipline could mean ordering one around in an abusinve manner to debase the sub.  There can be all kinds of ways to do that from ordering a person on the ground and act like a dog, to ordering them to lick the floor (or maybe worship some part of their body.)  Any of the above could also involve sexual stimulation (Which purists abhor.), or be totally asexual.

Some people are into one and not the other, but often they are into both as they involve actiivities that can often intersect. For example, a person can be bound so tightly that it is painful.

They all come under the heading of fetish play which can also involve other things like role play (teacher/student; doctor/patient, etc.) or my favorite, sploshing (covering the body with gooey or creamy food substances and licking them off while rubbing against each other.)

There are many others, of course, which run the gamut from the disgusting (IMHO) such as scat play, to the ridiculously sublime (dressing up like fairies and imagining that you are in a magical {typically asexual} wonderland).

It's a big universe out there, limited only by the imaginnation and the endurance of the body.

Yes, they both mean pretty much the same thing but I wouldn't put much stock in it when viewing a provider's profile. I have no idea where they even come up with this information and have never found anyone else with a satisfactory explanation. Some providers that I have talked to have been as clueless  as I am because it was checked on their profiles and they said they were most definitely NOT into it.

I was hanging out with Nikita Denise once and a guy sent her a text . . .

asking her if she did "BBM?"  Well, we spent more than a little while trying to figure out what the "M" stood for, both of us thinking "BB" meant bareback.  As some may have already surmised, we both had a pretty good chuckle upon finding out that he meant, "BlackBerry messenger."