Installing apps on iPhone is very easy. All you need is your iPhone with internet connection along with an Apple account which is free of cost. There are LITE versions or Demo versions which are available for free and others are paid Apps. There are two simple methods of installing apps on your device:
In your iPhone open app store and browse through the apps listed. The apps are also available in categories and you can view the top rated apps in Top 25 pane.
Select the app you want to download, tap on the price of the app and the tab buy now. If the app is for free tap free and then Download it.
After you tap download or buy it, It will asks your Apple ID Password. Fill it up and the download automatically begins (if the app is for free.) Or it asks for payment via Credit Card.
Firstly, you have to install iTunes, which can be downloaded through official iTunes Download Page. After installing iTunes, you can open iTunes Store, there Select the app you want to download.
Click on the price displayed or free (if it’s for free) , a pop up appears asking you your Apple ID Password. After filling it click buy and the download starts. Apps that are being downloaded can be seen in the downloads option of iTunes below the iTunes Store.
After the apps are downloaded you can Sync them to your iDevice.