What does the seed mean in basketball?

Seed means the position ranking for each NFL team that makes the playoffs. Six teams from the NFC and six from the AFC are ranked 1 - 6 seeds. Based on each teams record during the regular season or if they have won their division determines how high they are ranked/seeded. Winners of their divisions get the highest rankings 1-4 seeds and the last two teams with the best records over the other teams in each conference get the final two wild card seeds 5-6. The 1 and 2 seeds in each conference get the first week off from the playoffs while seed 3 plays seed 6 and seed 4 plays seed 5.
Seed is synonymous with rank. There are six seeds in each conference, corresponding to the top 6 ranked teams at the end of the regular season.