Worksheets that are mathematical tables showing figures in rows and columns, not sheets for your bed

A spreadsheet is a special kind of paper that an accountant uses to keep track of money other sets of numbers. A spreadsheet program does the same thing but it also has the ability to do some of the math for you, manipulate charts, create graphs, and add the data into some databases. This is a type of software.

a computer assisted accounting program

Early spreadsheets made the computer a valuable tool for accounting, and helped spread computers throughout industry. What is the "spreadsheet" or commercial application that will make VR a success

A grid that organizes data and performs calculations