Screen Capture Software
Screen capture software is a program that uses your computer as a camera. Try to imagine the screen capture software as your digital camera and anything displayed on your computer screen is what you would like to take a picture or video of.
Snagit
Snagit can be used for taking pictures of your computer screen and can enhance your image with effects or directional arrows.
Camtasia
Camtasia can be used to create video tutorials of your screen and can add effects such as animations, sounds, or quizzes.