Mashups may be a relatively new term to a lot of people, but basically, in order to understand mashups you will have to start thinking out of the box.  This means that you should not only be relatively focused on one dimension when we talk about mashup. 

A mashup may take varied forms and methods.  Generally, Mashups can be correlated with so many things such as digital mashups, music and audio mashups, video mashups, and mashups for web application hybrid. 

A mashup in whatever form refers to combining practically two things that each of these things may be the derivative of the other and essentially come up with a single, derived work. In terms of the Internet, a mashup is an application of the web that tries to merge one data with another data or with varied sources of data to come up with a solid data altogether.

Although mashups may relatively be complicated to understand and comprehend, working on downloading these mashups from the Internet is practically very simple and easy.  In order to effectively download any mashup, you will basically need to make sure that you are able to locate a mashedup file with similar derivation like music and another music or video to another video.  These types of mashup files are not difficult to download because the file types that made the single file are common with one another making the merging or the combining of the two files very simplified and easy. This is one trade secret for an easy downloading of a mashup file.