What is the significance of the phrase ''Bismillahir Rahmanir Raheem'' at the beginning of each Surah?

The phrase 'Bismillahir Rahmanir Raheem' is an Arabic phrase that is translated to 'In the name of Allah, the Most Gracious, the Most Merciful' in English. It is the first verse of each surah (chapter) in the Quran except for the ninth chapter, Surah Al-Bara'ah (or At-Tawbah), which does not begin with it.

The phrase is commonly known as Bismillah and is considered to be the opening of every chapter of the Quran. The phrase is recited by Muslims before they start any task, including reading the Quran, performing prayer, or eating food. The significance of this phrase lies in the fact that it reminds Muslims that all actions should be undertaken in the name of Allah and with His blessings and mercy. By invoking the name of Allah at the start of every chapter of the Quran, Muslims are reminded of their duty to follow the teachings of Allah and to seek His guidance in all aspects of their lives.

The phrase 'Bismillahir Rahmanir Raheem' is also used as a form of protection against Satan and other evil forces. Muslims believe that by reciting this phrase, they are seeking the protection of Allah and His mercy against all evil. It is also believed that the phrase brings blessings and good luck to those who recite it regularly.