Sahih Bukhari is one of the most respected and authentic collections of Hadith (sayings and actions of Prophet Muhammad) in the Islamic tradition, and it is considered to be one of the most authentic books after the Quran.

The book was written by Imam Bukhari, also known as Muhammad ibn Ismail al-Bukhari, who lived from 810 to 870 AD. He was a Persian Sunni Islamic scholar and traditionist who spent most of his life traveling to various parts of the Muslim world to collect and verify Hadiths.

Imam Bukhari spent more than 16 years traveling to various cities and towns in the Islamic world to collect Hadiths. He collected more than 600,000 Hadiths but only included around 7,275 Hadiths in his Sahih Bukhari which he considered to be authentic after a thorough examination and scrutiny. He used a strict criterion for the selection of Hadiths, and only included those that met his criteria of authenticity.

Sahih Bukhari is divided into 97 chapters (books) and each of these chapters is further divided into multiple Hadiths. Each chapter covers a specific topic, like the Book of Salah, the Book of Zakat, the Book of Fasting, etc.

The chapters in Sahih Bukhari are arranged in a specific order, starting with the most important and general topics, such as the Book of Faith, the Book of Knowledge, and the Book of Purification, to the more specific and detailed topics, such as the Book of Medicine and the Book of Battles.

The number of Hadiths in each chapter varies, some chapters have just a few Hadiths, while others have several hundred.

Overall, Sahih Bukhari is considered to be one of the most authentic collections of Hadith and it is widely used by scholars and students of Islamic theology to understand the teachings of Prophet Muhammad and the origins of Islamic law and practice.