IPad is a line of tablet computers designed and marketed by Apple Inc., which runs Apple's iOS. The first iPad was released on April 3, 2010; the most recent iPad models, the iPad Air and iPad Mini with Retina Display, were revealed on October 22, 2013 and will go on sale on November 1, 2013. The user interface is built around the device's multi-touch screen, including a virtual keyboard. The iPad has built-in Wi-Fi and, on some models, cellular connectivity.
An iPad can shoot video, take photos, play music, and perform Internet functions such as web-browsing and emailing. Other functions—games, reference, GPS navigation, social networking, etc.—can be enabled by downloading and installing apps. As of October 2013, the App Store has more than 475,000 native apps by Apple and third parties.
There have been five versions of the iPad. The first generation established design precedents, such as screen size and button placement, that have persisted through all models. The iPad 2 added a dual core Apple A5 processor and VGA front-facing and 720p rear-facing cameras designed for FaceTime video calling. The third generation added a Retina display, the new Apple A5X processor with a quad-core graphics processor, a 5-megapixel camera, HD 1080p video recording, voice dictation, and 4G (LTE). The fourth generation added the Apple A6X processor and replaces the 30-pin connector with an all-digital Lightning connector. The iPad Mini features a reduced screen size of 7.9 inches, in contrast to the standard 9.7 inches, and features similar internal specifications as the iPad 2. It also uses the new "Lightning" connector. iOS 6 added Siri to the third and fourth generations and the iPad Mini.The App Store. The biggest strength of the iPad can be found in the 300,000 apps designed specifically for the iPad. And going beyond these apps, the iPad is capable of running the 500,000 apps designed for the iPhone in compatibility mode. But it's not just the number of apps that make the App Store such a strong selling point, it's the time Apple takes to review each app individually before it can appear in the App Store. For the customer, this does two things: (1) ensure that the app does basically what is says it will do and (2) helps protect the buyer from malware or other mischievous apps.

Accessories. One advantage of being the market leader is that everyone wants a piece of the action. This has resulted in a vibrant ecosystem of iPad accessories that go beyond just tablet cases, wireless keyboards and external speakers. For example, the iRig allows you to hook your guitar into the iPad and use it as a multi-effects package, and the iCade converts your iPad into a classic coin-operated arcade system (minus the need for quarters).

Stability. The iPad is often referred to as a closed system, with Apple controlling both the hardware and the software. There are some disadvantages to a closed system, but one advantage is the stability it provides. While Google and Android app developers must support dozens and even hundreds of tablets and smartphones, Apple and iPad app developers are supporting a very limited number of tablets all based on the same basic hardware. Apple's app approval process also helps stability by ridding apps of the most egregious bugs before they are approved.

Ease of Use. While Android has made great strides in this area, Apple still leads in providing an interface that is easy to learn and simple to use. While Android tablets allow for more customization, which is great for people that love to tweak their devices, Apple's simple approach makes the iPad less overwhelming.

Plays Nice With iPhone and Apple TV. If you already own an iPhone or Apple TV, one big advantage to owning an iPad is how well they play together. Not only can you share apps between the iPhone and iPad, which is great for universal apps that support both within the same app, features such a Photo Stream blend together well. Apple TV owners will also enjoy AirPlay, which lets you connect your iPad to your HDTV wirelessly.

iPad: The Bad

• Little Customization. Both an advantage and a disadvantage, the downside of limited customization is that the tablet experience cannot be altered on the iPad. This means no widgets on the home screen, but it also means some apps simply aren't available for the iPad. Apple's approval process does keep some apps from appearing in the app store that could actually help the experience, such as an app that simply switches Bluetooth on and off so you can hook in your wireless keyboard without digging through menus. You can get it on Android, you can only get it on the iPad if you jailbreak the device and find your way around the App Store.
• Less Expandability. If you run out of storage space on the iPad, you may be left clearing out music, movies and apps. The iPad doesn't support flash drives to expand storage, and external hard drives and/or cloud storage can't be used to store apps. While all tablets are inherently less expandable than laptops, which in turn are less expandable than desktop PCs, the iPad tends to be more limited than some Android tablets.
• Limited Multitasking. Another trade off with good and bad aspects, the limited multitasking means apps will behave better alongside each other and battery life won't be drained too much, but if you really need true multitasking, the iPad cannot provide it.
• More Expensive. One big advantage to the iPad when it was released was the price point. $499 for an entry level tablet was tough to match, but as the market has matured, Android tablets have appeared that offer a good experience for less money. The 7-inch tablet market is making this even more clear, with current generation Android tablets going as low as $199. In comparison, the cheapest iPad -- the iPad Mini -- is $329.

The Samsung Galaxy Tab is a line of Android-based tablet computers produced by Samsung. The first model in the series, the 7-inch Samsung Galaxy Tab, was first introduced on 2 September 2010 at the IFA in Berlin. Since then there have been several models released, including models with 7.7, 8.9 and 10.1-inch displays. The Wifi Tabs all include a GPS system whilst the 3G/ 4G Tabs include phone capability.The Galaxy Tab 3 series refers to the third generation Galaxy Tab 3 7.0 8.0 and 10.1 and are again aimed at budget markets while the Galaxy Note series taking over the Higher-end market. The Galaxy Tab 3 7.0 was announced at the end of April 2013. The Galaxy Tab 3 8.0 and 10.1 were announced at the Computex in June 2013. All 3 devices share a similar design language to the Samsung Galaxy S4 and other recently released Samsung devices. The 7.0 retails for $199, 8.0 for $299 and 10.1 for $399.Advantages are that it is better and faster than ipad.Disadvantages are that there si no multitasking in samsung galaxy tablets.