Knowledgebase Home / What is CAPTCHA and What is it Used For?
// View Comments //

What is CAPTCHA and What is it Used For?

This guide will explain what CAPTCHA is and what it is used for.

What is CAPTCHA?

A CAPTCHA is a test to determine whether the user is a computer or a human. The most common type of CAPTCHA is an image of obscured letters or numbers displayed in a box. A user must type the sequence correctly before accessing the website or submitting data. As automated bots are not able to read these images, they are prevented from misusing the website’s resources.

The following image is an example of a common type of CAPTCHA:

CAPTCHA example

CAPTCHA example

You should consider adding CAPTCHA protection to your website if it has any of the following:

● Surveys or polls.
● Pages that accept file uploads or downloads by users.
● Any other pages that accept user-submitted data.
● Forms that process user-submitted data, including e-mail forms, comment forms, and registration forms.


reCAPTCHA from Google is one of the most popular among numerous methods for implementing CAPTCHA for PHP. For general information about reCAPTCHA, please visit For specific information about implementing reCAPTCHA with PHP, please visit

If you have any web hosting questions please feel free to reach out to us. We're happy to help.
Shared Hosting | Reseller Hosting | Managed WordPress Hosting | Fully Managed VPS Hosting

Our Guiding Principles

  • Provide consistent, stable, and reliable web hosting services.
  • Ensure rapid ticket response and quick resolutions to issues.
  • Never saturate or over-provision servers to ensure stability and speed for our customers.
  • Use only high-quality enterprise-class hardware to ensure minimal downtime from hardware failures.
  • Provide clear pricing with no hidden fees or gotchas.
Subscribe to comment notifications
Notify of
Inline Feedbacks
View all comments