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Open standards are becoming increasingly important. Governments around the world are starting to require applications that they purchase to support standard file types for interoperability and to prevent long-term vendor lock in.
Two of the most common formats found on the Internet at the moment are Portable Document Format (PDF) and Hypertext Markup Language (HTML) documents. These have similar, but distinct, capabilities and uses. Both are typically used for documents that contain text and images, and in newer versions can include video and audio data as well.