In American football, what annual event follows the regular NFL season to select new players?

NFL Draft

What animal produces pearls? What vegetable, related to broccoli, has edible green florets and is used in Italian pasta dishes? Who was named NFL Rookie of the Year for the 2021 NFL season? What type of rock forms when sediments are cemented together through compaction? Which rhesus factor in daily practice is most relevantly identified as positive or negative in blood types?