perldoc -f glob says:

    glob EXPR
    glob    Returns the value of EXPR with filename expansions such as
+ the
            standard Unix shell /bin/csh would do. This is the interna
+l
            function implementing the "<*.c>" operator, but you can us
+e it
            directly. If EXPR is omitted, "$_" is used. The "<*.c>" op
+erator
            is discussed in more detail in the section on "I/O Operato
+rs" in
            the perlop manpage.
....
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As shell expansion, this does what it promises. Here is an example excerpt from my /bin/sh on cygwin:

$ echo *
Desktop Mail _viminfo building-gcc-for-mips.txt car.pic gcc gdbtk.ini 
+kbuildsycoca.exe.stackdump kikbd.exe.stackdump parrot pwin32 x0 x1 xx

Administrator@RTC ~
$ echo *jd
*jd

Administrator@RTC ~
$ echo dwq
dwq
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Courage, the Cowardly Dog.