From the Harry Potter Series:
A horcrux is a portion of a persons soul that is saved in an inanimate object.
The finding of the horcrux is not tracable, but in the series Harry himself finds horcruxes of voldemort;
#2- Tom Riddle's diary
#6- his mothers ring
#6- necklace
#7- all the rest of them!
Harry found all of them with the help of Ron and Hermione.
No, he didn't die because he was Horcrux. Had he not been a Horcrux the killing curse would have killed Harry, instead of just the Horcrux.
He suspects but he isn't sure. Harry knows that all the founders of Hogwarts had items. He knew that Salazar's locket was a Horcrux and because Tom Riddle/Voldemort thought of Hogwarts as home it made sense to make them into Horcruxes. However, the diadem was 'lost' so Harry wasn't sure even Voldemort had found it until after reading Voldemort's mind he found out where it was and that it was a Horcrux.
There is no eighth horcrux, as Voldemort only created seven.
Nagini the snake was the last Horcrux to be be created and destroyed.
Yes, the horcrux inside of Harry Potter
No, but the diary Horcrux, was destroyed.
No she didnt....Dumbledore tells Harry that he is a Horcrux
J.K. Rowling never revealed the process in making a Horcrux.
Voldemort took Helga Huffelpuff's Cup from a descendant of hers, Hepzibah Smith, who showed the cup to him in Borgin and Burkes. She was found dead two days later, Voldemort had poisoned her and stolen the cup as well as Salazar Slytherin's locket (which he also made into a horcrux) from her home.
It depends what Horcrux your talking about, they do find them all and destroy them all though.
A horcrux is created when a witch or wizard rips off a piece of their soul and embeds it in an object. The horcrux will allow them to survive even if their mortal body should die.