What is the Difference Between iPad 2 and The new iPad 3?

The main differences between the iPad 2 and the iPad 3 (also known as the "new iPad") include:

Display: The iPad 3 features a "retina" display with a higher resolution of 2048x1536 (264 ppi), while the iPad 2 has a lower resolution of 1024x768 (132 ppi).
Processor: The iPad 3 is powered by a dual-core 1 GHz Apple A5X processor with quad-core graphics, while the iPad 2 has an older dual-core Apple A5 processor with a single graphics processor.
Storage: As first shipped, the iPad 2 and iPad 3 both have 16 GB, 32 GB, or 64 GB of storage. However, with the release of the iPad 3, Apple "downgraded" the capacity of the iPad 2 to just 16 GB.
RAM: The iPad 2 comes with 512 MB of RAM, while the iPad 3 comes with 1 GB of RAM.
Rear Camera: The iPad 2 features a 720p-capable rear camera, while the iPad 3 has a 5-megapixel 1080p rear camera.
Connectivity: The iPad 3 supports 4G data networks, while the iPad 2 supports only Wi-Fi and 3G. The iPad 3 also has Bluetooth 4, while the iPad 2 has Bluetooth 2.
Siri: The iPad 3rd Gen supports Siri when running iOS 6 or later, whereas the iPad 2 does not.
Dimensions and Weight: The iPad 3 has a slightly thicker and heavier design, with dimensions of 241.2 x 185.7 x 9.4 mm and a weight of 652 g, compared to the iPad 2's dimensions of 241.2 x 185.7 x 8.8 mm and a weight of 601 g.

In summary, the iPad 3 offers a higher-resolution display, improved processing power, more storage options, better rear camera, and improved connectivity compared to the iPad 2.