One of the six most authentic collections of the Ahadith which has 4800 Hadith (selected from a mass of 50,000) divided into many different subjects, each Section containing many Hadith.
His compilation of this Sahih comes second only to Sahih al Bukhari in terms of authenticity according to majority of scholars & is the second in the collection of 6 books called "Sihah Sittah"
With 3956 ahadith, Jami' At-Tirmidi is an invaluable addition to any person's library of hadith collection. It is also considered as the most authentic among the Four Sunan