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Percent-encoding
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<p>URL encoding, officially known as percent-encoding, is a method to <a href="/facts/Binary-to-text_encoding/InSaUsBb">encode</a> arbitrary data in a <a href="/facts/Uniform_resource_identifier/UjyqxTpA">uniform resource identifier</a> (URI) using only the <a href="/facts/ASCII/vGUI33Qu">US-ASCII</a> characters legal within a URI. Although it is known as <i>URL encoding</i>, it is also used more generally within the main <a href="/facts/Uniform_Resource_Identifier/UjyqxTpA">Uniform Resource Identifier</a> (URI) set, which includes both <a href="/facts/Uniform_Resource_Locator/pPD5g7Wq">Uniform Resource Locator</a> (URL) and <a href="/facts/Uniform_Resource_Name/DCaGkLLY">Uniform Resource Name</a> (URN). Consequently, it is also used in the preparation of data of the application/x-www-form-urlencoded <a href="/facts/Media_type/A31N5Fwj">media type</a>, as is often used in the submission of HTML <a href="/facts/Form_(web)/9Ivp2peo">form</a> data in <a href="/facts/HTTP/TWtvf7JD">HTTP</a> requests. Percent-encoding is not <a href="/facts/Case_sensitivity/VS2eGDmY">case-sensitive</a>. </p>