â¢ SALTATION (noun) The noun SALTATION has 5 senses: 1. (geology) the leaping movement of sand or soil particles as they are transported in a fluid medium over an uneven surface. 2. a mutation that drastically changes the phenotype of an organism or species. 3. an abrupt transition.
A CAPTCHA as you may well know is one of those annoying âType in the letters you see in the image aboveâ things you see on many website signup pages or comment sections. A CAPTCHA image is designed so that a human can read it without difficulty while a computer is unable to.
A CAPTCHA is a program that protects websites against bots by generating and grading tests that humans can pass but current computer programs cannot. For example, humans can read distorted text as the one shown below, but current computer programs can't: