It seems like you're asking about the CAPTCHA used by Omegle. Omegle uses CAPTCHA challenges to prevent automated bots from accessing its chat service. These challenges typically require users to complete tasks such as selecting images or entering text in order to prove they are human.
If you're encountering a CAPTCHA on Omegle, it's a standard security measure. Simply follow the on-screen instructions to complete it, and you should be able to