An emoticon (a blend of 'emotion' and 'icon') is a pictorial representation of a facial expression, hand gesture, or other nonverbal cue, often typed with punctuation marks and letters, used to convey emotion or tone in electronic text communication. Examples include :-) for a smile or :-( for sadness. They serve to enrich the emotional context of text- based messages where body language is absent. A Joystick is an input device. Emulation is the imitation of one system by another. CAPTCHA is a test to distinguish humans from bots.