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The layer of the Internet that includes content indexed by search engines is the Surface Web. This area contains publicly accessible websites that are easily discoverable through search engines like Google, Bing, and others. Examples of this content include standard web pages, articles, blogs, and media that users can access without needing special permissions or tools.

In contrast, the Deep Web refers to parts of the Internet that are not indexed by traditional search engines. This includes databases, private websites, and content behind paywalls. The Dark Web is a subset of the Deep Web that requires specific software, configurations, or authorization to access, and is often associated with illicit activity. The Invisible Web is similar to the Deep Web in that it contains unindexed content, but this term often emphasizes databases and other information that is not easily found through regular search engines.

By understanding these distinctions, it becomes clear why the Surface Web is the correct answer. It represents the portion of the internet that is readily accessible and visible, in contrast to the more obscure areas of the Deep Web and Dark Web.