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    <p>Searching is one of the most common and important tasks in <a href="https://en.wikipedia.org/wiki/Computer_science" rel="nofollow noreferrer">Computer Science</a>.</p> <p>The most basic search algorithm is a <a href="/questions/tagged/linear-search" class="post-tag" title="show questions tagged &#39;linear-search&#39;" rel="tag">linear-search</a> (also called "sequential search"). Each item in a collection of data is examined in sequence until the sought item is found.</p> <p>If the collection in question has already been sorted, for instance, then a more efficient <a href="/questions/tagged/binary-search" class="post-tag" title="show questions tagged &#39;binary-search&#39;" rel="tag">binary-search</a> is possible.</p> <p>Search can become more complex when, rather than finding one instance of a specific item, we want to find all items meeting a certain set of criteria. For instance a <a href="/questions/tagged/sql" class="post-tag" title="show questions tagged &#39;sql&#39;" rel="tag">sql</a> query can specify extremely complex search criteria, and much of relational database design involves the planning of an efficient way to perform those searches.</p> <p>Another more complex search scenario is graph search, in which a series of nodes and edges must be traversed. Common algorithms for this domain include <a href="/questions/tagged/breadth-first-search" class="post-tag" title="show questions tagged &#39;breadth-first-search&#39;" rel="tag">breadth-first-search</a> and <a href="/questions/tagged/depth-first-search" class="post-tag" title="show questions tagged &#39;depth-first-search&#39;" rel="tag">depth-first-search</a>. In many cases, a heuristic search algorithm such as <a href="/questions/tagged/a-star" class="post-tag" title="show questions tagged &#39;a-star&#39;" rel="tag">a-star</a> can achieve more efficient results by making use of additional information about the problem.</p> <hr> <p>Do <strong>not</strong> use this tag for questions about specific search tools within an API. Some more relevant tags for that would be the following: </p> <ul> <li><a href="/questions/tagged/bing-api" class="post-tag" title="show questions tagged &#39;bing-api&#39;" rel="tag">bing-api</a>: For the <a href="http://bing.com" rel="nofollow noreferrer">Bing</a> search API.</li> <li><a href="/questions/tagged/google-search-api" class="post-tag" title="show questions tagged &#39;google-search-api&#39;" rel="tag">google-search-api</a>: For the <a href="http://google.com" rel="nofollow noreferrer">Google</a> search API.</li> <li><a href="/questions/tagged/facebook" class="post-tag" title="show questions tagged &#39;facebook&#39;" rel="tag">facebook</a>: For searching with the Facebook api.</li> </ul>
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