How the diary was a hocrux
After discussing with Professor Slughorn the subject of horcruxes, Riddle decided to use items that not many people knew about. Especially family heirlooms and private personal items such as a diary that he kept during his youth.
The diary is considered a horcrux because a diary is Tom Riddle's life memories and since his soul lived through that it is possible for the diary to carry his soul onwards until of course, Harry destroyed it in his 2nd year.
Tom Riddle's diary is one of the horcruxes because Harry could only destroy it by using a baslisk fang, which he did in this book.
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