What's the difference between Google Docs and Drive when uploading ?

So I just uploaded a pdf of mine to Google docs/drive but I noticed after uploading the pdf it was assigned a google drive url like ( drive.google.com/file ) however I have noticed that other people have pdf files uploaded that are assigned a google docs url like this ( docs.google.com/file ) . I just started using google docs/drive can anyone explain to me why a PDF upload would get assigned one or the other url ?

Google Drive is not an updated version of Google Docs. It's actually an information organization system, and Google Docs now works within it. Basically, Drive is Google's answer to Dropbox.

First, understand the capabilities of Google Docs. It is basically a word processor and cloud storage service hosted by Google.

In Google Docs, you can:
1) import existing files and share or continue to work on them, or
2) create new documents altogether through the Google Docs platform, and
3) if desired, you can also export Google Doc from one file type to another, at least to a limited extent. (Excel to PDF, etc.)

For lack of a better comparison, Google Docs seems to be Google's hybrid, online-based system that is complementary to MS Office, while it also addresses the increasing demand for cloud file storage capabilities by users.

Now comes Google Drive!

In case you are unfamiliar with Dropbox, they provide free and paid cloud storage. You can access your Dropbox account through multiple platforms - online, through a file folder on your computer desktop, through your mobile device(s), and so on.

Google Drive seems to be incorporate the same functional principals, so that you can have your Google Docs, Maps, Calendar, etc. all syncing throughout multiple personal devices. This includes iPhones, Macs, PCs, Androids, and good, old-fashioned website access.

I hope this helps?

Google Docs and Google Drive are completely different applications,

Google Docs - Users can upload Word or other text-based documents into it and convert them to the online editing program. Google docs are the part of Google drive, you create documents and you can save those in Google Drive for later access.

Google Drive – Cloud storage solution for storing files. It’s introduced to allow multiple users to have access to files and folders from any Internet-connected device that supports the Google Drive application.

It helps to store documents, presentations, music, pictures, videos or any other files that you want to keep ever.
You can also open files in any formats that are not supported by your computer.