image-based CAPTCHAs

Image-based CAPTCHAs are security tests that ask users to identify, select, or analyze images to verify they are human and not automated bots. They often present a grid of pictures and prompt users to click on specific objects, such as bicycles or traffic lights. Because recognizing images typically requires human perception and judgment, these CAPTCHAs help prevent automated programs from gaining access to websites or online services, ensuring that users are genuine individuals. They are widely used due to their effectiveness and user-friendly nature.