Convertible and slate are two main types of tablet PCs, convertible tablet looks like normal laptops except the screen can be rotated all the way around and laid down flat across the keyboard, you can input information through the screen using a stylus or through the keyboard. Slate tablet PCs only have screen interface, the keyboard and mouse function can be used comfortable by virtual keyboard at display and touch screen. Off course most of us habitual operate computer by keyboard and mouse, but I think this habit will be changed by PDA computer’s strong entertainment and ultra-mobile function.

Off course, tablet PCs have advantages and disadvantages. Through the technology of tablet PC developed and enhanced in past few years, the disadvantages are shrinking in number, and the perks are becoming more and more enticing.

The advantages of tablet PCs:
The distinct feature of tablet PCs is ultra-mobile function. You can take easy and use them anywhere you go, the same way you would take a notebook and pen. That means when your boss bumps into you in the hallway and gives you a number of assignments, you can write them down. In meetings you don't have to hide your face behind the monitor of your laptop because you can lay the tablet PC flat on the table. For students, this mobility is also great - you can study your notes while you're waiting in lines or even in the car.

Tablet PCs let you use digital ink to store handwritten notes, graphs, charts, and pictures. You don't have to worry about taking your laptop or a notepad and pen to meetings or classes. Using the stylus, tablet PCs record your handwriting and drawings. They can convert your handwriting to text if you need to turn in an assignment typewritten.

All of the money you have been spending on pens, pencils, highlighters, notepads, papers, binders, folders, staples, and paperclips stays in your pocket. Because of the digital ink option on tablet PCs, much of the need for paper supplies and writing utensils is eliminated. You can keep all your notes on your computer.

Finally, one of the advantages of tablet PCs over regular laptops is that you don't lose any functionality from your computer. Tablets operate on similar platforms and run many of the same programs. In fact, many programs integrate all of their normal functions with digital ink, so you can add notes to documents and even email your handwritten notes to someone.

Some disadvantages of Tablet PCs:
Despite my obvious zeal for tablet PCs, I recognize that there are still some disadvantages. First is the price. The prices for brand name tablet PCs are coming down quite a bit from when they were first released, like Ipad, Samsung, Sony and etc. but on average, you can expect to spend more for a tablet PC than for its equivalent laptop. But there are lots of tablet PCs with no brand name, which has cheap price and can give you same enjoy with brand name tablet PCs.

The handwriting-to-text conversion does not always work the way you wish it would. Just like speech-to-text systems require a trained style of speech to work properly, tablet PCs recognize a trained penmanship easier than the way you may write naturally. A lot of the kinks in these conversion systems have been worked out - but don't plan on handwriting your next novel expecting to be able to convert into a print-ready copy with no problems.

Finally, the smaller size of Tablet PCs is both an advantage and disadvantage. It makes Tablet PCs lighter and more mobile than other computer, but the viewing area is also smaller. Likewise, the keyboard also shrinks down to accommodate the smaller size, the virtual keyboard on tablet PCs is very universal, so if you feel like your fingers are already cramped on a lapt