What is a vfat signature?

Recently, I have noticed that I cannot access my USB flash drive filesystem (it was of FAT type, as far as I can remember). Fedora did not mount it automatically and lsblk could not see the partition. So, I decided to create new partition (instead of wiping the device at first) with fdisk. The process was straightforward (fdisk did not complain a bit), but I noticed that fdisk asks me as a last step about removing a thing called "vfat signature": Created a new partition 1 of type 'Linux' and of size 7.3 GiB. Partition #1 contains a vfat signature. Do you want to remove the signature? [Y]es/[N]o: I am aware that happily creating new partition in such a case may not be the best thing. I do not know yet, what I would like to/should do. However, nonetheless, primarily I am curious, so I would like to know: 1. **What is a "vfat signature"?** 2. **What is the reason that fdisk detects it?** 3. **What is the purpose that fdisk detects it?** 4. **Is it somehow related to a term that I have encountered in the context of Windows, "disk signature"?** 5. **Why would I like to remove it or not?** I have searched for a similar question here, but found only [this question](https://unix.stackexchange.com/questions/395950/fdisk-partition-contains-a-ntfs-signature-remove-it) which does not answer my doubts.