"Captcha yani kya hota hai?"
Captcha, jo ki "Completely Automated Public Turing test to tell Computers and Humans Apart" ka akronym hai, ek security mechanism hai jo internet par automated bots aur humans ko alag karne ke liye istemal kiya jata hai. Iska uddeshya yeh hai ki computers aur bots ko roka ja sake jo kisi website ya online service par unauthorized access karne ki koshish karte hain.
Captcha ek tarah ka challenge-response test hota hai jisse karne ke liye humans ko asaani se samajh aata hai, lekin automated computer programs ke liye yeh mushkil hota hai. Yeh internet security ke liye ek prachalit tareeka hai kyonki bahut se bots aur spam programs automated tareeke se websites par login attempts karte hain, comments karte hain, surveys complete karte hain ya kisi bhi form ko fill karte hain.
Captcha typically images, distorted text, audio clips, or a combination of these present karta hai. Examples mein, ek user ko kaha ja sakta hai ki woh kisi distorted text ko read karein aur usme se letters ya numbers type karein jo woh samajh sakein. Is tarah se, server verify kar sakta hai ki user ek human hai aur koi bot nahi.
Iske alawa, modern Captcha systems ne innovate kiya hai aur user-friendly alternatives bhi provide karte hain. Kai baar, captcha mein aapko images mein se specific objects, animals, ya vehicles ko identify karna hota hai. Is tarah ke Captcha puzzles ko solve karke, users human proof banate hain.
Yeh tarika bahut prabhavi hota hai spam se bachne ke liye, lekin kabhi kabhi users ko bhi thoda pareshani ho sakti hai, jaise ki kuch cases mein images ya text itna distorted ho jata hai ki sahi tarike se read karna mushkil ho jata hai. Kuch logon ke liye audio-based Captcha challenges bhi available hote hain, jo visually impaired users ke liye helpful hote hain.
Overall, Captcha ek crucial tool hai jo internet par security aur privacy ko protect karne mein madad karti hai, ensuring that online services and websites are used only by genuine human users and not automated bots or malicious programs.