Does an 8 camera security system include a DVR?

Not all of them include a DVR, but many do. Here's a list from Amazon: Amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keyWords=8+camera+security+system+with+DVR&x=0&y=0">http://www.Amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keyWords=8+camera+security+system+with+DVR&x=0&y=0