Applications for iPhone and iPod Touch are IPA format files. Applications, including various kinds of programs, can be downloaded to the iPhone in two ways - via a computer to a phone with a jailbreak, or directly from the phone itself using the AppStore.
Instructions
Step 1
The first method is good because you can download all applications to the iPhone completely free of charge. If your iPhone is jailbroken, that is, a firmware jailbreak that makes the operating system of the device open, just drag the file with the iPhone program into the iTunes window and synchronize the phone. The application will appear on the mobile phone screen. This method is pirated because you do not pay for paid apps, however, Apple does not prohibit jailbreak functions.
Step 2
The second method is completely legal. You need to create an account in the AppStore through iTunes. IPhone apps in the AppStore can be either free or paid. To purchase paid applications, you must attach a credit card number to your account. After creating an account, you can log into the AppStore using your username and password from both your computer and iPhone. You can download programs directly from the iPhone, the size of which is no more than 20 MB.