Houzz is the new way to design your home.
Wide openings get the support they need from this stalwart horizontal beam
The rough-hewn header here is visible, supporting and transferring the weight of the roof to the unseen studs placed vertically at the ends of the wall opening.
There is a header above this transom window, keeping the weight off the glass panes.
When an entire wall is open like this, a steel header may be used. The wider the opening, the thicker the header must be.
The post and lintel construction seen here is essentially the same concept as a header; the horizontal header transfers weight to the vertical posts.
There is a header under the frame and the flat paneling.