Though IBM always used DE-15 connectors for their Video Graphics Array hardware, several VGA clone hardware makers initially did not. Instead, some early VGA hardware, both monitors and graphics cards, used the PGC standard of a DE-9 connector for analog RGB (VGA).
DB-9 is Serial 😭
Everyone calls it DB-9 but its technically DE-9 and VGA is DE-15
https://en.wikipedia.org/wiki/D-subminiature
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😮 TIL
I know because I had to find the right one in a parts drawer with several
In the very early days the 9 pin was used for video. The extra pins were added when VGA obtained Plug ‘n Play compatibility.
That was CGA/EGA, digital RGB
VGA has always been 15 pin D-sub, analog RGB
Source