Help- understanding Lost+Found Folder

[Hyuhjhih]

As part of my irl work shedule, i was assigned to recover some recurring files back from my phone. But I lack enough knowledge and experience in the case of filesystem backuping and repairing.

So, can anyone here please explain me how I can open a lost+found file(ref linux kernel//android) , and if possible provide me a brief knowledge about fsck command and how these incorporated files work.

Thank You.