Differences between ms-word and ms-Excel

Vista is an operating system. Excel is a spreadsheet. Vista would be classed as Systems software and Excel as Applications software. An operating system is responsible for the proper working of the computer. Without an operating system, you cannot use your computer. Applications software is software designed to do particular kinds of work, Excel being designed to be a spreadsheet. It needs an operating system to work on. It interacts with the operating system in order for it to work. So the operating system will do things like provide the memory space it needs to run or facilitate the saving of a document or help print it, amongst many other things.