What does na rm TRUE actually means

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Whenever we want to have NA in our data,we used na.rm=TRUE to get proper results for mean,mode etc. What does na.rm do? I could understand that rm is for remove,which we even use for deleting variables.But why have we written na in small? R is case sensitive?And what does Boolean value TRUE does here?
Jun 9 in Data Analytics by Avinash
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