Excel is software that allows users to create tables to calculate and analyze data. It is part of Microsoft Office and allows users to create spreadsheets, where all Excel functions, equations, and charts can be done. A cell is the basic unit in a spreadsheet, represented by a row and column intersection, where text, numbers, or formulas can be entered. Tables in Excel make it easy to add more rows without needing to update references or formatting, and graphs visually represent information in different formats like pie charts, lines, bars, and columns to better understand the data.