It's free to get and generally takes less than 30 minutes to enable on Joomla & Wordpress wesbites. All you need is a Google account. Go to https://www.google.com/recaptcha & select the blue blox Get reCaptcha.
Prevent spam on your website with minimum impact on genuine website users.
What is a reCAPTCHA?
"reCAPTCHA is a free service that protects your website from spam and abuse. reCAPTCHA uses an advanced risk analysis engine and adaptive CAPTCHAs to keep automated software from engaging in abusive activities on your site. It does this while letting your valid users pass through with ease. reCAPTCHA offers more than just spam protection. Every time our CAPTCHAs are solved, that human effort helps digitize text, annotate images, and build machine learning datasets. This in turn helps preserve books, improve maps, and solve hard AI problems." - Google ReCaptcha https://www.google.com/recaptcha/intro
1. Generate a v2 reCaptcha (v1 is no longer supported as of March 31st 2018).
2. Copy your secret and public keys once captcha is generated.
3. Add them to the relevant plugins or extensions on your website.