iPad is a line of tablet computing devices, which is designed and marketed by Apple Inc. that runs on Apple iOS. It is a very popular and light-weighted tablet PC introduced in April 2010. Its interface is similar to iPhones but with larger touchscreen display.

iPad is specially designed for consumers who want a mobile device that is bigger than a smartphone but smaller than a laptop for entertainment multimedia. This is because iPad combines the computing power of a laptop or desktop computer with the portability of a smartphone. Actually, iPad runs the iOS mobile operating system that is a Unix-like OS made up of four abstraction layers: the core OS layer, the core services layer, the media layer and the cocoa touch layer.

Like the iPhone, even iPad supports multi-touch (using multiple fingers at once) and gestures, such as swiping or pinching objects on the screen.  iPad can even execute the third-party apps designed for iPhone, in addition to the iOS apps written specifically for the iPad. These apps can be downloaded through iTunes or directly from the Apple app Store on the iPad.

Specifications of iPad:

Some of the general specifications of iPad device are:

  • Size is of a sheet of paper
  • Weight: 1.5 pounds
  • Display: 9.7-inch LED backlit glossy multi-touch screen
  • Screen resolution: 1024x768 pixel resolutions (and 2048x1536 resolution in the Retina Display of iPad 3 and iPad4)
  • Battery backup: Lasts up to 10 hours

Functions of iPad

An iPad can be used to shoot video, play music, take photos, watch movies, read e-books and perform Internet functions such as web-browsing and emailing. Some of the other functions like games, GPS navigation, reference, social networking, etc. can also be enabled by downloading and installing the iPad apps.

Features of iPad

The most notable features of the iPad are its vibrant display, long battery life wherein it can play a 10-hour video nonstop, and can have massive number of applications. Additionally, the device is also equipped with environmental sensors such as an ambient light sensor, an accelerometer and a magnetometer.

Some of its other features include 802.11n Wi-Fi connectivity, Bluetooth 2.1, Enhanced Data Rate (EDR), and also the options for 3G cellular connectivity (4G LTE in the newer iPad).

Various iPad generations

First generation iPad: It established the design models, such as screen size and button placement, that are continued through all models.

Second Generation iPad (iPad 2): iPad 2 added a dual core Apple A5 processor and VGA front-facing, 720p rear-facing cameras that are designed specifically for FaceTime video calling.

Third generation iPad (iPad 3): This generation actually added a Retina display to the iPad. It was designed with new Apple A5X processor with a quad-core graphics processor, had a 5-megapixel camera, supported voice dictation, HD 1080p video recording, voice dictation, and 4G (LTE).

Fourth generation (iPad 4): iPad 4 came up with a new feature called Apple A6X processor and replaced the 30-pin connector with an all-digital Lightning connector.

iPad Mini: It features a reduced screen size of 7.9 inches, and possess similar features as that of the internal specifications as the iPad 2. It also uses the new "Lightning" connector.

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