Basically, we use Captcha on webpages to check webpages are accessed by humans not by bots. Without Captcha on webpages, there can be various attacks such as DOS (denial of service) attacks where Login page or registration page can be scripted and submit by using bots.
You can see Captcha are mostly used on Login, forgot password, Registration page right after logging into a web application we won’t use it mostly.

DNTCaptcha.Core is a captcha generator and validator for ASP.NET Core applications.

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