According to WIKIPEDIA ;
A screenshot, screen capture, or screen dump is an image taken by the computer to record the visible items displayed on the monitor or another visual output device.
Basically Screen capture, or print screen is most efficient way to share or demonstrate your program or your reviews about the program via.. computer generated Screenshots. Screen Capture Tools do everything which basic tools can't. like ; Capture and record anything you can hear or see on your PC. It doesn't matter if the video you want to capture comes from your webcam, the PC desktop, or from inside websites.
jing is free Screen capture software developed by TechSmith Corporation . you can easily capture web screenshots by clicking Jing's happy, always-ready "sun" icon...or pressing a hotkey of your choice. You can capture a window, pane, or region and make point to easily explain your screenshot with adding text box, arrow, highlight, or rectangle.
another one great screen capture tools from TechSmith Corporation Take a "snapshot" of anything on your PC screen.
Send it, store it, turn it into a detailed graphic, find it later. Snagit comes with eleven preset buttons that make screen capture a cinch! just Capture a region of which one you want for screenshot , Add text from a window.
[Download: Download Snagit Trial ]
WebKut is an Adobe AIR application that allows you to capture web pages, or parts of them in a very simple way. It provides you 3 capture options: the entire page, the current view, or only a selection.
Quick Screen Capture is good screen capture software .It allows you to take screenshots from any part of your screen in more than 10 ways, and save images in BMP/JPG/GIF formats. you can easily edit your screenshot like; drawing shapes, arrows, text, filling color, cropping, resize. [[Download]
FastStone Capture is a powerful, lightweight, yet full-featured screen capture tool that allows you to easily capture and annotate anything on the screen including windows, objects, menus, full screen, rectangular/freehand regions and even scrolling windows/web pages.
Websnapshot is another one Adobe Air screen capture Application.
Skitch screen capture tools is not just tools its more then screen capture tools . it allow you to capture any application,chat moment and easily sketch on your screenshot. after sketching you can upload it to share with your friend and viewers . easy to Re-open images from your Skitch History to reuse the screenshots.[Download] Skitch is only available for Mac user.
Windows Vista Free Screen Capture Tool come with window vista Vista Home Premium, Business, Enterprise, or Ultimate Editions. its not available for Window vista home Basic edition. The Snipping Tool allows you to capture your screen using four methods and then save these snips as a JPG, GIF, PNG, or MHT file.
It will capture what you can see in the window, the entire page, just a selection, a particular frame... basically it saves webpages as images. It can capture any Java or Flash embedded in a page, but to do this it requires Java to be installed in the browser.
Thumbalizr is online tools to take screen shots of web pages. User can customize the dimensions of each screenshot taken.