What is the difference between gcc -ggdb and gcc -g

-g and -ggdb are similar with some slight differences, I read this here:

-g produces debugging information in the OS¹s native format (stabs, COFF, XCOFF, or DWARF 2).

-ggdb produces debugging information specifically intended for gdb.

-ggdb3 produces extra debugging information, for example: including macro definitions.

-ggdb by itself without specifying the level defaults to -ggdb2 (i.e., gdb for level 2).