Twitter has different colored checkmarks to indicate the type of account:

Blue

A blue checkmark indicates that an account is a subscriber to X Premium and meets Twitter's eligibility requirements.

Gold

A gold checkmark indicates that an account is an official organization account.

Gray

A gray checkmark indicates that an account represents a government or multilateral organization.

These checkmarks help users distinguish between genuine accounts and impostors. However, the checkmark does not mean that tweets from a verified account are accurate or truthful.