Why does a bubble pop?

I thought it was strange that bubbles just popped...so, enters the question.Why does a bubble pop?
A bubble pops because it is not stable. Clever if you see that that is just restating the question, not answering it. A bubble made with a liquid undergoes draining of the liquid out of the film until it can no longer support its own structure. Keep in mind all bubbles are by definition a balance of the force of expansion and forces of containment. Bubble gum bubbles pop because the polymer flows and eventually a hole develops. There are many foams which are very stable. In order for a bubble to be stable, there must be forces which make this configuration more stable than a more condensed one. All liquids have a surface tension, this means that all liquids prefer a small surface area configuration to a large one, and believe me a foam is a large surface area! So, why are some stable for really long times? Surfactants. I will leave you here... there's alot more to say on the subject....Why does a bubble pop?
Bubble contains air or vapour surrounded by a film of water or in general, the liquid. This is lighter than the surrounding liquid and hence it pops up.Why does a bubble pop?
cuz it gets filled with to much air
Pressure from the air and usually when it has expanded as far as it can expand.