Protect Your Site from Bots with CAPTCHAs and JavaScript Challenges
Briefly

Bot is short for "robot," and bots are applications that perform automated actions on the Internet.Although not all bots are bad, most have malicious purposes, from stealing sensitive information to attempting unauthorized access.Thus, bots can represent a security threat to any website.For this reason, you should consider "antibot" solutions to protect your site from bots.
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