After screening and interviewing candidate, they check for background details. Once they have made their decision, they contact the successful applicant, as well as everyone who was interviewed.
If you are selected for the position: Congratulations! You have met or exceeded the essential qualifications of the position. You may be given a conditional offer, pending appeals from bargaining unit employees.
After completion of those thing they call for the document formalities. Once its done they give the offer letter.