creating random directory could be deleted anytime?

Question

i have simple record audio with providing the path of where i want to save the record

await open?.startPlayer(
             fromURI: 'foo_fooo.aac'
           );

well here i noticed that i am free to make any directory. and it be already saved . i tested it for many times' , many random directory names

as the previous paths it is out of my getTemporaryDirectory();

Directory temp = await getTemporaryDirectory();
 outputs
'/data/user/0/com.example.myAppName/cache'

now my question is : wher 'foo_fooo.aac' does be exist exactly ? and does it will be deleted automatically ? i am a bit confused