Captcha is a special test that helps to distinguish computers and people. Created it to determine who now uses the resource - a computer program or a real person. This test has appeared for a very long time, but only with the increase in the popularity and accessibility of the Internet, it has become so common.
Types of Capcha
Captcha can be fed in the form of ordinary pictures, animations, distorted letters. More complex capps are a set of pictures of different subjects, where the user needs to choose only the necessary. For example, specify the photo where there are cars or live items. The computer program is very difficult to cope with a similar task, although it may seem too simple for humans. Some distorted phrases seem not easy, sometimes a person makes mistakes when entering them. Capcha can annoy, but you need to know that it is this simple technology that allows you to protect sites from malicious robot programs.
Why do you need a pin?
On sites it is set to protect against malware that can access resources, content. A special software is created, which, if suspected, will issue this captcha to check the user. If there is foundations - a person, instead of the desired page, receives a window where you need to introduce some smear symbols from a photo, etc.
It's impossible to enter
Do not get upset, some pictures are very difficult for perception, continue to change the captcha to the new one. Usually there is such a function in all types of Captcha. In many cases, you can hear the audio recording, the heard text must be entered in the field.
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