This type of software testing is very informal and unstructured and can be performed by any stakeholder with no reference to any test case or test design documents. The person performing Ad-hoc testing has a good understanding of the domain and workflows of the application to try to find defects and break the software.
Wolfram Alpha is a computational search engine (sometimes referred to as an answer engine). The interface looks similar to that of a regular search engine but queries typed into the search box result answers to specific questions rather than listings of websites that may be relevant to the query.
The goal of Yahoo Search is to discover and index all of the content available on the web to provide the best possible search experience to users. The Yahoo Search index, which contains several billion web pages, is more than 99% populated through the free crawl process. Yahoo also offers several ways for content providers to submit web pages and content directly to the Yahoo Search index: Yahoo Search Submission. Submit Your Site for Free: - Suggest your site for inclusion in Yahoo Search (requires registration).