Amazon.com would like to be “The Walmart of the Web,” and it is indeed the Internet’s top retailer. But in 2010, another firm emerged as a serious challenger for the title of ‘Walmart of the Web’: Walmart. Though Walmart is a latecomer to the world of e-commerce, the world’s largest retailer appears to have its sights set on Amazon and is ready to battle it out for online e-tailing supremacy.