Microsoft Excel is a commercial spreadsheet application written and distributed by Microsoft for Microsoft Windows and Mac OS X. Pre-2007 versions of Excel use XLS as the primary format for saving files. It features calculation, graphing tools, pivot tables, and a macro programming language called Visual Basic for Applications. It has been a very widely applied spreadsheet for these platforms, especially since version 5 in 1993, and it has almost completely replaced Lotus 1-2-3 as the industry standard for spreadsheets. Excel forms part of Microsoft Office. The current versions are 2010 for Microsoft Windows and 2011 for Mac OS X.
Microsoft Excel up until 2007 version used a proprietary binary file format called Binary Interchange File Format (BIFF) as its primary format. Used as the basis for XLS files it is a persistence format that supports authoring and manipulating content in workbooks and workbook templates. Most versions of Microsoft Excel can read CSV, DBF, SYLK, DIF, and other legacy formats.
Web pages are predominately marked up in HTML, these are then displayed through browsers such as Safari, Internet Explorer or Mozilla Firefox. It provides a means to describe the structure of text-based information in a document by denoting certain text as headings, paragraphs, links etc and to supplement that text with interactive forms, embedded images, and other objects. HTML source code is used by the Web browser and typically not seen by the user. The raw HTML can be viewed by choosing View Source from the Web browsers view menu or by opening the HTML file in a text editor.
Any Web Browser (e.g. Internet Explorer, Safari, Firefox, Google Chrome)