Microsoft Excel is a spreadsheet program that is used incredibly widely. Having a good understanding of how Microsoft Excel works is a key skill for any office worker today. Spreadsheets let you store and organise data in a grid of rows and columns. It lets you control and process your data by using formulas and functions.
In its most simple applications, it can be used to summarise data showing totals, averages and also to very quickly produce graphs and charts. However, it is an extremely powerful and flexible tool and is used in a very wide variety of far more complicated applications such as for producing full financial models for businesses or groups of businesses and statistically analyzing scientific data.