Your Apple ID is a username that identifies you to Apple (and the services and devices you use). It is usually your email address. You have a password associated with your Apple ID that is different from your ID. This is not the password you use every time you open your individual devices like computer, iPad, iPhone, etc. In most cases, it is also not the same as the password you use to log in to your email address. It is the username and password that you use to identify yourself as yourself to all Apple services and devices that you use. When you create an account for any Apple service, such as the App Store or iTunes Store, an Apple ID is created. You don't have to create a new account for each device and service; you can use the same Apple ID for all of them.
Your Apple ID contains all of your contact, payment, and security information that you use across all Apple services. This simplifies your user experience in the Apple environment and ensures that your experience and information is consistent across all the Apple devices and services you use.
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