Twitter is relaunching its verification application system after suspending it more than three years ago. Twitter users can now submit applications to request verification in-app, right from their account settings. The verification application process requires you to choose an eligible category matching their account, a method of identity confirmation, and to submit a request a verification request. If the application gets approved, a blue badge is automatically added to your profile to show that your account is of public interest and it is authentic, notable, and active.
Source: https://www.bleepingcomputer.com/news/technology/twitter-rolls-out-new-verification-process-to-get-your-blue-check/