Imagine being a first year little witch or wizard sitting up in front of everyone at the school putting on the sorting hat and being sorted into a house. Realistically certain personalities and traits are one of the reason you are put into a certain house right? You can kind of tell what kinda person you are based on the house your sorted in. Some questions are to be raised thought, like Neville being in Gryffindor, he seems more like a Hufflpuff kinda guy but later he proves his worthiness.
Each house has certain traits and a history, you decided which on you want to be in...but maybe the hat will choose differently or maybe you would be like Harry and plead not to put into Slytherin? Personally I am a fan of Gryffindor but Ravenclaw seems pretty cool too.
Gryffindor House: Founded by Godric Gryffindor and are known for their courage. The house colors are scarlet and gold and the dorms are located behind the fat lady in the towers on the 7th floor. Some known past Gryffindo's were all the Weasly family, Serius Black, Remus Lupin, Dumbledore himself and even Hagrid. As everyone knows there was no horcrux made from a Gryffindor relic thanks to Dumbledore keeping it safe.
Hufflepuff House: Founded by Helga Hufflepuff and are known to be just and loyal. The location of this house is known to be near the kitchens in a dungeon level area very "dissimilar" from a potions classroom. The house ghost is the Fat Friar and their colors are yellow and black with a badger on the banner. Some well known Hufflepuffs are Cedric Diggory, Nymphadora Tonks, and Hanna Abbott.
Ravenclaw House: Founded by Rowena Ravenclaw and is a house fit for those of whit and learning. The ghost is the founders daughter Helena Ravenclaw and the Grey Lady. The location in the castle is also in the towers on the west side. There is a talking bronze handle for the entrance of the dorm and they do not have a traditional password, rather a question and when answered correctly they may gain access to the dorm. The house colors are blue and bronze with an eagle on the banner. Cho Change, Luna Lovegood, are well known members.
Slytherin House: Founded by Salazar Slytherin their colors are green and silver with a snake on the banner. They are known for their love of the dark arts and are pretty much hated by everyone. The location of their dorm is in the dungeons under the lake. The Bloody Baron is their ghost. Tom Riddle, Phineas Nigellus Black, all the Malfoys, and most of the Black family are well known Slytherins.