This blessing of thanksgiving is said after completing a meal.
Blessings for Food
This series of blessings recited after meals is about much more than just food.
Lighting the candles, saying Kiddush and other Shabbat dinner rituals.
Can I say birkat hamazon on treyf food?
All about the grace after meals.
By blessing after we eat, we elevate the act of eating by connecting with God.