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 It’s so easy to grab a DVD from the shelf and pop it into your DVD player to watch a movie. But do you know what’s going on in your DVD player when you watch a movie? A lot!   While the vinyl record seems outdated and is old technology, it’s actually quite similar to when you place a disc in your DVD player and press “play”. In fact, picturing a record player’s needle “reading” the grooves in each record can help you visualize how a DVD player works.   The DVD player uses a laser – instead of a needle – to read the data imprinted in bits and bumps on the DVD. The laser in a DVD player is red, which is one of the key differences between a DVD player and a Blu-Ray player, whose laser is blue. The laser reads the data by shining on the spinning disc …