File System, also abbreviated to fs, is a way to store, organizeand allocates the storage space of the device. It makes access and lookup data easier.
Withfile system, data that saved in a storage medium would be sep rated into different pieces. By giving each piece a name, the data can be easily isolated and identified. The group of data is called "File" and the structure and logic rules that used to manage them and their name called "File System". When users create a file, it helps store, read, revise, and transfer files.
Simply put, FAT32 is less used now and it only supports individual files that are maximum o4 GB. exFAT is like the upgrade of FAT32, working on both Windows and Mac. And it is mostly used in USB partition. NTFS is the most widely used format. It has better security and the file size can be up to 256TB. As for APFS, it is the file system of Apple computers and only works in macOS High Sierra or later.