Selective vs Optional - What's the difference?

As adjectives the difference between selective and optional

is that selective is of or pertaining to the process of selection while optional is not compulsory; left to personal choice; elective.

(en adjective)

Of or pertaining to the process of selection.(rfex)

(of a person) choosy, fussy or discriminating when selecting.

He's very selective and spent hours in the store choosing a new shirt.

(chiefly, US, not comparable) Having the authority or capability to make a selection.

In the USA, military conscription is controlled by the Selective Service.

* selectiveness

(-)

Not compulsory; left to personal choice; elective.

On that beach clothing is entirely optional .

* obligatory * mandatory * compulsory