Yesterday, Google announced that it is rolling out its new Search within a Site feature. When searching for specific sites instead of keywords, users are able to conduct a secondary search of those sites within Google results.
For example, if a user searches for "NASA" at Google, the first result returns NASA.gov. Underneath that result is a search box with a submit button with the text "Search nasa.gov."
The reason for the update? "Through experimentation, we found that presenting users with a search box as part of the result increases their likelihood of finding the exact page they are looking for," wrote Ben Lee, software developer, and Jack Menzel, product manager on the Official Google Blog.
Lee and Menzel also offered insight into how Google is implementing the feature. "This feature will now occur when we detect a high probability that a user wants more refined search results within a specific site. Like the rest of our snippets, the sites that display the site search box are chosen algorithmically based on metrics that measure how useful the search box is to users."