A spreadsheet is a computer application or program that enables the user to tabulate and collate data. This data can then be used to make calculations, show graphical representations or analysis.

A spreadsheet comprises of a grid of ‘cells’ arranged in rows and columns and information can be inserted into each cell.

Each cell can contain text, numbers and formulas.

A formula is a calculation based from the contents of cells or a total of a combination of cells. The total in that formula can change if the content of the combination cells used is also amended.

Spreadsheets can be useful for home budgeting or accounting and they make it easy to display information.

Spreadsheets can consist of a number of different worksheets that can include different data as well as enabling cells on one worksheet to be used and referenced on other different worksheets.

Information can also be sorted and filtered by a spreadsheet.

The Microsoft Office spreadsheet is called Excel but there are open office spreadsheets available, including internet based web apps such as Google spreadsheets.

Spreadsheets have a number of tools included to support many different types of calculations and can include graphical presentations such as graphs, pie charts etc.

Home key is the one which is used to return the cursor to the beginning of the line. This happens in documents only where we can edit.

In cases where the documents cannot be edited, the home key is used to return the cursor to the beginning of the document.

Guide keys guide the user through the documents. There are mainly 4 guide keys- up, down, left and right arrow keys. Their main function is to move the cursor in the document.

In a normal way Firewall means a wall or partition designed to inhibit or prevent the spread of fire. In computing way firewall is a wall and shield that protect a network or system from unauthorized access via outer.

Firewall is a security system which protects the System from Intruders and hackers. It is a network security device that keeps an eye on incoming and outgoing traffic and stop and slowdown viruses and malware to spread from one computer or sub net or network to another.

Word Processing Packages are the set of programs written specifically for text manipulation. Word processing mainly involves operations like creating, editing, viewing, searching and replacing, formatting, saving and printing text. Various Word Processing Packages also allow us to design and include various pictures, graphs and charts in the text. With personal computers becoming quite affordable, their quality of being versatile and with the use of e-mail, office correspondance has improved a lot. Desktop Publishing has been revolutionized and the quality of results is astonishing.