What is the advantage of a blue ray disc players over regular dvd players?

Been shopping online for a TV. In a review of one very inexpensive tv, it said that the picture was much better with a blue ray
Update: LOL! @ Sugarbee. An elderly sister in our cong. who'd had the same TV for almost 20 years got a new one as a gift from her son. Once it was mounted on the wall, she excitedly turned it on. After a couple of days she said. "Hmph! this thing has the same shows on it as the old one."
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