Microsoft Excel 2007 is a spreadsheet program used to enter, analyze, and present quantitative data in a grid of rows and columns. It allows for what-if analysis by changing values to assess effects on calculations. Excel worksheets can have over 17 million cells organized across 16,384 columns and 1,048,576 rows. Data such as numbers, dates, and text can be entered into cells. Examples demonstrate creating timetables, exam schedules, sorting data, and calendars using Excel's formatting and layout tools. Homework involves summarizing commands used in the examples.