This sūrah of five verses takes its name from the word al-qadr (power, destiny, measure, worth) in the first verse. It is about the Laylat al-Qadr (the Night of Destiny, Power, and Measure), which occurs in the third part of the holy month of Ramadān. Spending that night in devotions is of great worth.
We have surely sent it (the Qur’an) down in the Night of Destiny and Power.