How do i use i,v in pairs()

Question

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Answer 1

On each iteration, the for loop calls its iterator function with two arguments.
See this example :
a = {"one","two","three"}
for i, v in ipairs(a) do
print(i, v)
end

Answer 2

A = {
"This" = "that",
"That" = "this"
}
For I, v in pairs(A)
--code here
End

Its generally used for dictionaries.
I is the key/index of it, so in this case the first item's key is "this" and the second's is "that". V is value.