CAPTCHA
CAPTCHA stands for Completely Automated Public Turing test to tell Computers and Humans Apart. It provides challenges that are easy for humans to complete but difficult for computers. For example, before accessing a website, CAPTCHA may ask you to identify the dog in a collage by clicking specific areas. Many websites use this tool to prevent computer bots from spamming registration systems and creating fake accounts. It’s also helpful for preventing false comments on review sites and message boards.
