A licensed person has the required education, experience, insurance and qualifications to obtains a license. They must pass a competency examination before practicing.

Licensed individuals are screened for prior criminal history.
The department can discipline and even revoke a license if the person doesn’t live up to professional standards. This is not a total safeguard, but it is a strong incentive to do good work.

You may be able to sue the licensee in civil court for problems related to the work done.

How to check if your Contractor is Licensed and Insured:
https://www.myfloridalicense.com/wl11.aspow