Microsoft Works was a software suite that included a word processor, spreadsheet and a data management system. Over the years, Microsoft Works got additional features such as calendar, dictionary and a terminal emulator.
Microsoft Works is compatible with Office file formats, .doc and .xls, so you can open those file types in Works with ease. There are also special converters for Microsoft Word that will allow you to open Works Word Processor files. Unlike Word, Excel can easily import Work Spreadsheets files because they are using the same format.
Microsoft Works was discontinued in 2007 and replaced by Microsoft Office.