What is this plug for?

[82 cutlass 401]

Wile cleaning out my 'new to me car' i saw this plug under the ashtray on the drivers side and im just curious what it was or is for?

Car is 1982 cutlass supreme v6

 

[Jimmy]

OBD (on board diagnostic) plug

 

[pontiacgp]

since you bought a G body and joined the forum you should introduce yourself and add some pictures of your new purchase...

 

[tc1959]

ALDL connector. Used to check trouble codes.

 

[TURNA]

Thats for the new website upgrade

 

[axisg]

little orphan annie secret decoder ring ?