What is an App?
App is short for Application. In short, it's another word for a piece of software. Most apps are quite small and easy to download. Many are free, while others are available for a small charge. You can get apps for almost any purpose, from office software to media players and even games.
As most of these apps are downloadable, they are ideal for laptops and netbooks that have no disk drive. Many of the apps are fairly small, so they can also be fitted onto a USB memory stick and installed onto devices that don't connect to the internet.
Where can you get Apps?
There are a number of great sites on the internet that list and link to essential laptop downloads. For example, the popular technology site CNET has a very good feature here. PCWorld magazine also has a comprehensive list.
If you have a Mac, Apple have created their own App Store. You can find more details here.