Excel is spreadsheet software that allows users to create and analyze data in tables. It is part of Microsoft Office and lets users input values to automatically calculate totals, print tables, and create simple graphs. In Excel, data is organized into worksheets made up of individual cells identified by row and column letters and numbers. Charts are visual representations of worksheet data that make patterns and trends easier to see, such as pie charts for percentages, column charts for comparisons, bar charts for horizontal comparisons, and line charts for trends over time. Excel includes buttons for formatting text, inserting graphs and tables, and adding mathematical functions.