Answer:
Virtual Object (VO) browser extension is a SilkTest add-on component for testing Web applications. VO browser extersion uses sophisticated pattern recognition techniques to identify browser-rendered objects. The VO extension sees Web pages as they appear visually; it does not read or recognize HTML tags in the Web application code. Instead, the VO extension sees the objects in a Web page; for example, links, tables, images and compound controls the way that you do, regardless of the technology behind them.