What is app store and how to use it ?

What is app store and how to use it ?

Apple brand breakthrough innovations, where more than half a million in use. Can be compared to a virtual market square, where the users iPod, iPhone, iPad, etc..devices can be found categorized, free of charge or in return for access applications.
The fee applications, including the euro or dollar prices are shown, are calculated for the current daily average rate. the AppStore to use Internet access (WiFi or mobile internet) and an Apple ID is required. Apple has a user ID, ​​which is Apple's use of the services used. The Apple  site, e-mail address to register.