CAPTCHA forms are security measures designed to distinguish between human users and automated bots. The acronym stands for "Completely Automated Public Turing test to tell Computers and Humans Apart". These tests present challenges that are easy for humans to solve but difficult for computer programs.

You encounter CAPTCHAs when:

• Creating new accounts on websites
• Submitting contact forms or comments
• Making online purchases or reservations
• Accessing sensitive information or protected pages

Modern CAPTCHAs come in several formats:

• Text-based: Distorted letters and numbers you must type
• Image recognition: Selecting specific objects from a grid
• Checkbox verification: Simply checking "I'm not a robot"
• Invisible CAPTCHA: Background analysis of user behavior

While CAPTCHAs protect websites from spam, fraud, and automated attacks, they can sometimes frustrate legitimate users. Accessibility remains a concern, as visually impaired users may struggle with visual challenges. Many services now offer audio alternatives for better accessibility.

When you encounter a CAPTCHA, remember it's there to protect both the website and your data. If you have difficulty completing one, look for the audio alternative or refresh button to get a new challenge. These security measures, while occasionally inconvenient, play a crucial role in maintaining online security and preventing automated abuse.