How do NFL teams approach building their rosters, through free agency or the draft?

NFL teams build their rosters through a combination of the draft and free agency. The draft is an annual event in which teams select eligible college football players. Teams are assigned draft picks based on their previous season's performance, with the worst teams receiving the highest picks. This allows teams that struggled the previous year to have the first opportunity to select the best available players. Teams can also trade their draft picks with other teams.

Free agency, on the other hand, is a period during which teams can sign players who are not under contract with any other team. Players who have been released by their previous team or whose contracts have expired are free agents. Teams must also stay under the league's salary cap while building their rosters, which can be a challenge when signing high-profile free agents.

Both the draft and free agency are important tools for teams to build their rosters. Successful teams typically use a combination of both methods to fill their rosters with talented players who fit their team's specific needs.