is there a difference between _id n objectid

i want to set the objectid manually, from the node express appbut when i change the _id it appears in document"_id": "helloworld",but in auto update,it appears to be this"_id": {"$oid": "5c922cf660724f0b8a124015"},​so is there any difference between _id n the second 1because i will be doing find based on _id​

Submitted March 20, 2019 at 12:28PM by aminnagpure