Spreadsheets are used in a variety of different ways – from analysing statistical data through to managing projects. In essence they are a way to store tabular data – whatever that data may be and wherever it came from, either manually input or imported as a result of using a PDF to Excel converter like the one you can see at https://pdftables.com/.
Spreadsheets allow for you to store data, automatically create formulae to make calculations, analyse the information and create visual representations of the data such as graphs that you may want to include in your wider reporting documents.
They can be used for everything from small sheets that contain just a few columns right through to more complex information that can be contained within macros and pivot tables. One of the beauties of spreadsheets is that they can be as simple or complex as you need them and they can grow with your needs over time and can be amended very easily.
Excel is a package that is provided with the Microsoft Office Suite and Office 365 subscription and is available for personal, student and business use depending on what your individual or company requirements are.