What do you call the board that sorrounds the garage opening part _i dunno wat it's called_ HELP !!?

Question:what ii mean the the garage opening part is the part that open you know ! yeah the board that ussually sourrounds that wat is it called ??

Answers:
If you are talking about the board that faces the street, and covers the gap between the door frame and siding, it is called casing.

If you mean the frame that is perpendicular to the door, it's a jamb.