X lets anyone pay for a verified account (the blue tick goes public). This lets other people know that someone is verified as a real person who is paying for their account.
As outlined on the X website:
The blue verified badge on X lets people know that an account is authentic.
We recommend accounts maintained by users in music, acting, fashion, government, politics, religion, journalism, media, sports, business, and other key interest areas to apply to be verified on Twitter. Accounts that are not verified are promoted less than those that are (this is to reduce the power of bots).
To have a verified accound, your account must have the following:
Some common characteristics of verified accounts include: