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Why does the global variable a exist without having been created here?

In

f := Module[{a}, a;]

In

?a

Out

Global`a

I don't understand why the global variable a was declared and exists. Sometimes the way Mathematica works feels very confusing to me.

Thank you. :)

Why does Mathematica choose the mechanism that makes the global variable a here while parsing?

In

f := Module[{a}, a;]

In

?a

Out

Global`a

I don't understand why Mathematica goes in the way that the global variable a is declared and not removed. Maybe there are its own purposes or intentions of why Mathematica is constructed in that way. Sometimes the way Mathematica works feels very confusing to me.

Thank you. :)

Why do the global variables a and b exist without having been created here?

In

f := Module[{a}, a;]

In

?a

Out

Global`a

I don't understand why the global variable a was declared and exists. Sometimes the way Mathematica works feels very confusing to me.

Thank you. :)

Why does the global variable a exist without having been created here?

In

f := Module[{a}, a;]

In

?a

Out

Global`a

I don't understand why the global variable a was declared and exists. Sometimes the way Mathematica works feels very confusing to me.

Thank you. :)