Excel is a spreadsheet program that allows users to create and format workbooks containing spreadsheets to analyze data. Users can track data, build models, write formulas, pivot data, and present it in charts. The ribbon interface organizes commands into tabs like Home, Insert, Page Layout, Formulas, Data, Review, and View. Users can enter and format data, insert items, adjust page setup, create formulas, sort/filter data, check spelling, and change views. Formatting options include borders, styles, fills, fonts, wrapping text, and number formats to enhance the professional appearance of spreadsheets.