What is offline or online data entry

As the name suggests, Data entry jib is a work where you need to enter the data given to you by your employer or company for which you are working.
But there are two types of data entry jobs. One is online whereas the second if offline
I have already talked about online so in this article i would prefer to talk about the offline data entry jobs.
Basically offline data entry jobs is a kind of job in which you are doing your work locally without even internet connection. So it means that you are performing the data entry into some local program like Word, Excel, etc. or even their own proprietary app. You may still need to download their application or even the data to input. But you don’t need Internet connection to do the work. Sounds cool. Doesn’t it?
Now you must be thinking that what kind of data you have to put? Or what is your work?

What is offline data entry? And what is the work in offline data entry?