What is a Captcha code & Why it is required??

Before captcha there were issues with API, like automated scripts and bots, people do use to hit sites to do operations and collect data. Some of them were lighter, but some were heavy reducing site speed and increasing load.
Also, there can be a DDoS attack by using actions like WordPress for comments, topics, and replied on the forum.

So, to tackle this a JavaScript program was written leading to more sophisticated code, captcha to be required making these API calls fail and block until the captcha is verified.
So, in the captcha, there is a UI where the task of identifying images/or code happens, and a backend service where google sends and verify a secret code. On the fulfillment of matching of the code from frontend and server, authentication is done.
So, the user can be identified and allowed to proceed with any actions. This way only genuine users, and not bots, can use the site and the site performs optimally.
there are two popular options right now
1. GCaptcha
2. HCaptcha

A CAPTCHA (Completely Automated Public Turing test to tell Computers and Humans Apart) is a type of challenge-response test used to determine whether or not the user is human. It is typically used to prevent automated bots from performing actions on a website, such as submitting forms, creating accounts, or posting comments.

CAPTCHA code is typically a distorted image of letters and numbers that is difficult for a computer to read but easy for a human to recognize. The user is prompted to enter the characters they see in the image, and if the characters entered match the expected value, the user is granted access to the website.

CAPTCHA codes are used to protect websites from unwanted automated bots and scripts. These bots can be used to perform a wide variety of malicious actions, such as spamming, scraping content, and even launching denial-of-service attacks. By requiring a CAPTCHA, websites can ensure that only human users are able to perform certain actions.

There are different types of CAPTCHA codes, such as Text-based CAPTCHAs, Audio-based CAPTCHAs, and logical CAPTCHAs. Text-based CAPTCHAs are the most common, where the user is prompted to enter the characters they see in an image. Audio-based CAPTCHAs are used to help visually impaired users, where the user is prompted to enter the characters they hear. Logical CAPTCHAs are designed to be more user-friendly and less frustrating, such as solving a math problem or selecting a specific image.

Captcha is used while registering on Google Site and commenting on Blog or Website. Apart from this, there are many other such works for which Captcha Code is used for security. Captcha code is actually a program, which prepares the test and grade which only a human can pass, no computer or machine.

The full form of Captcha is "Completely Automated Public Turing Test To Tell Computers And Humans Apart". The Captcha Code was first created in the year 2000 and was first used by Yahoo Company.

So for your information, let us tell you that Captcha Code Number was created because at one time hackers used Spam to create traffic on their website. Because of which a link to your website could be sent by commenting on any blog. So troubled by this, this wonderful technique was adopted.