Yes and no. All iPad models are designed to print wirelessly using AirPrint and are not equipped with USB ports. However, you can purchase USB adaptors for iOS devices. Most stock and third-party apps, such as the Mail app, have a printing option somewhere within the app. Just look for the app’s share icon (an arrow or box with arrow) or settings to send your document to an AirPrint-enabled printer to print.
Ever since the launch of Microsoft's suite of Office apps for iPad, users have noticed the lack of one key function: the ability to print. While Microsoft has insisted that future versions of Word, Excel and PowerPoint for iPad will add printing capabilities, no timeline has been announced.
Luckily, there are workarounds that make it possible to print from the mobile version of your favorite Office application. While the world waits for Microsoft to update Office 365 and its iPad apps to accommodate hard copies, users can start printing now thanks to third-party software. ThinPrint Cloud Printer from Cortado does the trick, and can be found on the iOS App Store free of charge.
UPDATE: Apple has added AirPrint to iPad iOS 4.2.1. This makes it possible to print directly from the iPad over a wireless network.
As of the initial release of the iPad, this is not currently available. The iPad OS has no support for printers, thus any printer -- whether wired or wireless -- can not be interacted with.
Whether Apple plans to add this feature in upcoming OS releases is still unknown.