A cursor is the tool we've got to iterate through records.
You can loop through the results of your query and do whatever you have to do with each record.
I've got to disagree with pritaeas on the sp or triggers part. You use a cursor when you need to handle each record differently, in a specific order where a case won't cover things. Usually they are too expensive (in terms of resources) and don't get the job done as fast as processing bulk data would.
I've developed an app that takes the data in a text file and moves it to specific columns in an Excel file. My computer has the Excel 2010 installed. So the application works fine with no issues. However we've begun to upgrade computers and software in the office ...