Question

what is a uploading? can an anonymous user upload? if yes, how?

Answer 1

Uploading is the process of moving digital files such as photographs or documents from your computer and placing them on to a central server so that someone else can retrieve them or to a website so others can see them. For example, you might save photographs from your digital camera on to your computer and upload them on to a social network such as Facebook, where you can allow friends and family to see them.
An anonymous person can not upload.

Answer 2

uploading is a type of file transfer.when user transfers any type of data to remote computer or system from his computer then it process is called uploading.
I hope this may be helpful for u.