Download Manager Data Usage

[JAzns]

I have installed a data manager app that told me that this morning from 7-10am an app called "download manager" used up a total of 70mb of my mobile data at a steady pace. But then from 10am till now (10:30) it hasn't used any of my data (My phone hasn't been used all morning). What is this download manager app, why does it use so much data, and how can I uninstall it or limit its consumption? Also, why was it using up data at some time intervals but not using up data at other time intervals? Thx for the replies.