Frequently two views, or two displays of one view, occur on the page together. One common example is a listing of content with a few curated items selected via more specific criteria. It’s simple enough to create two displays and show the curated one above the general listing. This presents a problem: content that appears in the curated list needs to somehow be excluded from the general listing.
The filter provided by this module exclude nodes (or another content) from a view, by excluding the results of one view from another one. This allows you to filter a view results by another view.