Los captchas y la accesibilidad
Una breve explicación en I'm Not A Robot : CAPTCHA stands for Completely Automated Public Turing Test to tell Computers and Humans apart and it’s a way to filter out bots and fraudulent automated activity from the behaviour of real people. It's an umbrella term describing several different techniques presented to the user to determine if they are human. A CAPTCHA challenge could be a random collection of letters and numbers, text obscured with background noise, puzzle challenges or audio challenges asking the user to enter the letters and numbers heard with a lot of background static noise. All of these are termed CAPTCHA as they're asking the user to demonstrate they're human and not an automated computer program. The theory is humans are very good at being able to identify distorted text, numbers and audio but not a computer program. A computer program i.e. bot can't reliably identify displayed text or audio and so it's a very effective way to stop bot activ