A conditional offer of employment is a job offer contingent on you first meeting certain conditions or requirements before starting the job. The conditions often include successfully passing certain aptitude tests, background checks, drug screenings, or a physical exam.
Receiving a conditional job offer is a positive sign that the employer sees you as a strong candidate. It means they're interested in your expertise but need you to meet specific requirements before landing the job officially.
You don't have the job yet: Although delivering additional documents is usually just a formality, receiving a conditional job offer rarely equals signing an employment contract and getting the job. It's important that you take advantage of this time to apply to different jobs just in case.