The 1911 is a semi-auto pistol. It is a specific model, sort of. The original 1911 was designed by John Browning, manufactured by Colt, and adopted by the U.S. military in 1911. Currently this design is made by various manufacturers, the various makes referred to as clones of the original.
Because the gun has been around for so long, is so popular, and the various makes all share the design, a separate forum is devoted to this gun. But it is a semi-auto pistol.
Spend some time around here just reading and asking questions before worrying about what gun to buy. Plus, before we can make a recommendation we really need to know what your primary reason is for purchasing a firearm, i.e. hunting, defense, target shooting etc. You also need to try some different calibers and decide on that before making a commitment to purchase a specific gun.
BTW, you will find really, really good info on this site. There are many guys here who know their stuff. I'm sure some of them will be along shortly to give you better advice than I can.