更 'even more' + 多 'many.' Functions as an attributive ('more X') or as a noun ('more'). Universal on Chinese websites: 查看更多 'See more,' 更多内容 'more content.' Compare 更多的 with the optional 的 (often dropped before nouns): 更多人 / 更多的人.
grammar
更 alone is the comparative adverb ('even / more'), but 更多 is fixed and behaves like an adjective: it can directly modify nouns. To say 'much more,' add a degree word: 多得多 / 多很多 (predicative) or 更多更多 in repetition for emphasis.
