Translation, ‘Supplication of great armor. (Jawshan = armor, Kabir = great) 

A supplication was revealed to Prophet Muhammad (ṣ). When the Holy Prophet (ṣ) was struggling with his heavy armor in a battle, the Angel Jibril descended and gave him this supplication to safeguard him and his people as a superior form of protection. It comprises 100 sections and contains 1000 titles and attributes of God. 

It is recommended to be recited on the first night of the month of Ramadan and at least three times in the month of Ramadan and for this reason, it is commonly recited on the Laylat al-Qadr (night of power).