We all know what a rendering is, but do you know what it means within the context of video editing? We refer to a render or to rendering as something you do to compile all the assets of a video edit and make it “one” for “output” to a single file, mostly a .mp4, or .mov file (the first for Mac, the latter for PC).
The definition of rendering on wikipedia refers to graphics, but holds true for a video sequence in an edit software as well. Rendering is generating an image from a model (i.e. an edit sequence) by means of computer programs. Rendering software renders data into [moving] picture.