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1What it technically is
A pergola is vertical posts or pillars supporting crossbeams and an open lattice roof, traditionally trained with woody vines — the open lattice is the defining feature that separates it from a solid-roofed structure.

Privacy that isn't a wall
The fence you build once
Sunlit attic living room with exposed wood beams
A concrete block grill station in your yard
Dew-covered green grass blades in soft light
Porous patio options: pavers, poured concrete, or gravel
Growing Grapes on a Fence You Own
Open-plan kitchen and living room with island seatingA pergola is vertical posts or pillars supporting crossbeams and an open lattice roof, traditionally trained with woody vines — the open lattice is the defining feature that separates it from a solid-roofed structure.
Depending on who's talking, 'pergola,' 'arbor' and 'bower' are often used interchangeably; an arbor is sometimes specifically a pergola with a built-in bench, but the boundary between the terms is genuinely loose, not a strict specification.
The pergola form goes back to ancient Egypt and was a standard feature of early Renaissance Italian gardens before spreading through the rest of Europe — the 'shade plus climbing plants' idea has had a few thousand years to get simple.
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