A download manager has one task: to help you download (or possibly upload) files from the internet for storage and to organize those files. One feature of download managers is that you can schedule when you want downloads to occur and have access to filters to ensure you are getting the downloads that you want.
Some useful features of download managers include: status window pop ups, the capability of pausing downloads and the option to set what you what done with the file once is has been downloaded. The scheduler feature allows you to choose when to download and where to download from.