A fast screen recorder is software which allows you to capture what's happening on your PC screen and then sharing it onto a video called a screencast. Most screen recorders allow you to choose between continuously recording the computer screen or just one area or window, as well as allowing playback with text and even voice over. The software will download all the data on the computer onto a remote server so you can watch the screencast on another computer of choice at any time. Screen recorders also allow for the data to be emailed directly from the software.
There are many screen recorder software packages available for download but it's always better to go for a paid package. Free software may be fine if you are only using one screen, but if you have multiple monitors (which is very likely) then paying for a package which includes multiple screens may save you money in the long run. Another important consideration is the frame rate of the software you're going for. Frame rate is the maximum number of frames per second that the screen will display.
A higher frame rate allows the video to load more quickly and without skipping or looking jerky. Some free software also limits the number of displayed frames, whereas some paid software offers unlimited display. You'll find that there are many options available when choosing free versus paid software, so make sure that you are aware of all the features before you buy. However, if you go for a paid package, you'll find many nice add-ons like screen wipe free software, desktop capture or leader board recording and editing tool, amongst others