Short answers, pulled from the story.
The AFC South was created before the 2002 season as part of a league-wide realignment after the NFL expanded to 32 teams. It was formed from two former AFC Central teams (the Jacksonville Jaguars and Tennessee Titans), one AFC East team (the Indianapolis Colts), and one expansion franchise (the Houston Texans).
The AFC South has had the same four members since its formation in 2002: the Houston Texans, Indianapolis Colts, Jacksonville Jaguars, and Tennessee Titans.
Only one AFC South team has won a Super Bowl: the Indianapolis Colts, who won Super Bowl XLI following the 2006 season. The Houston Texans and Jacksonville Jaguars have never appeared in a Super Bowl.
As members of the AFC South, the Colts hold a 572-514-8 regular season record, a 23-25 playoff record, and have won 14 division titles. Across their full franchise history, they have 16 division titles, 29 playoff berths, and three NFL or AFL championships.
The Houston Texans made the playoffs for the first time in 2011, their tenth season of existence. They clinched the spot in Week 14 with a 20-19 win over Cincinnati, and went on to win their first playoff game 31-10 against the Bengals before losing to Baltimore 20-13 in the Divisional round.
The AFC South set the NFL record for best combined division record in 2007 with a 42-22 mark, a .656 winning percentage. The previous record had been held by the 1975 AFC Central at .643.