What is the Difference Between Similar But Different Things, Terms, and Objects

What is the Difference between Dvd-R and Dvd+R

DVD or digital versatile/video disc is the most common word we hear now a day. Like movie DVDs, video game DVDs etc. DVDs are the upgraded form of CDs. they are better in quality, specious and of enhanced technology that can run over advanced systems with advanced software. DVDs has almost completely wiped out CDs now.