- A method to encode arbitrary data in a Uniform Resource Identifier (URI) using only the limited ASCII characters legal within a URI. Although it is known as URL encoding, it is also used more generally within the main Uniform Resource Identifier (URI) set, which includes both Uniform Resource Locator (URL) and Uniform Resource Name (URN). As such, URL encoding is also used for the preparation of data of the
application/x-www-form-urlencoded media type, e.g., for the submission of HTML form data in HTTP requests. When a character from the reserved set (a “reserved character”) has a special meaning (a “reserved purpose”) in a certain context, and a URI scheme says that it is necessary to use that character for some other purpose, then the character must be percent-encoded (for example, / becomes %2F). ← Wikipedia
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