Market Failure T.T Help me!!!!!!

I'm studying microeconomics and I have a big problem with the term "Market Failure" :confused: I've found some info as well as read documents but it seems to have many ways to define this term :(
Plz help me about this - definition and example :D
1 more question is that: When mentioning "Market Failure", people usually tell about the pollution. Whyyyyyyy??????? :confused:
Thx for all :X:X:X:X:X:X:X
Sorry for my bad English :D :D :D :D :D
 
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