What are Snap Caps?

I've been using the A-Zoom models almost exclusively since I had a Traditions part company on me one evening. Most unsettling to see something go zipping across the living room(gave the Pom a moment).

A while back, I picked up a tray of .22lr at a gun show, only to find that the ammunition was dummy rounds. Works well in my .22lr rifles and pistols. If anybody would like some, drop me a line and I'll send some out.
 
I do have a question about snap caps is there a number of times they are good for? Or after a number of times using one is it wise to throw it away and put in another one?
 
I have a revolver with the firing pin attached to the hammer.Do I still need snap caps,as it seems like I wouldn't need them?
 
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