The Şükür thanksgiving offering is an offering that can be made at any time out of gratitude to Allah. This type of offering is often made after a wish has been fulfilled, a test has been passed or a calamity has been averted.
What is the difference between Adak vow sacrifice and Şükür thanksgiving sacrifice?
A vow is generally an intention that is made in order for a wish to be fulfilled. Şükür-Thanksgiving offering is intended after an event has successfully occurred The offering of a vow is obligatory, an offering of gratitude is permissible.
