The Adobe Portable Document Format (PDF) is standard for document exchange. The PDF created by Adobe Systems in 1993. The goal of these products is to enable users to exchange and view electronic documents easily and reliably, independently of the environment in which they were created. Last update for format was released in 2009.
During 17 years, PDF is very popular among the formats for storing and exchange of information. The benefits that are now made to occupy a leading place to PDF are an open standard, multiplatform, data protection and the text-search features.
PDF describes text and graphics in a device-independent and resolution-independent manner. PDF also includes objects, such as fonts, encodings, interactive elements, security and signatures, file attachments, metadata, annotations and hypertext links.