Identify the web that forms the topmost layer and stores content that can be accessed as well as indexed by search engines such as Google, Yahoo, and Bing.

The topmost layer of the web is known as the Surface Web. This portion of the internet comprises all the content that is readily accessible and can be indexed by search engines like Google, Yahoo, and Bing. It includes websites, blogs, social media platforms, and other online resources that users can reach without any special permissions or protocols.

Search engines crawl and index the content found in this layer, allowing users to obtain information through standard search queries. The Surface Web represents a significant but relatively small part of the entire internet, which is much larger than what is indexed by search engines, as much of the content lies within the Deep Web or other areas that are not accessible or indexable.

In contrast, the Deep Web includes databases, private corporate sites, and other areas not indexed by standard search engines, while the Dark Web is a subset of the Deep Web that requires specific software to access and is often associated with illegal activities. The term Hidden Web is sometimes used interchangeably with Deep Web, but it generally refers to non-indexed content that is not typically accessible via standard browsing methods.