Seamless-backdrop product shot
Product shot on a curved sweep of paper so there is no visible wall-to-floor corner behind it. White is the common version, not the rule.
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What it is
A roll of paper (or vinyl) curves down the wall and out along the table, so the subject sits on one continuous surface with no visible wall-to-floor corner. Photographers call the curve a 'sweep'; at room scale, built as a plastered cove, it is a cyclorama or infinity wall. 'Seamless' describes only that missing corner. The paper itself comes in every color, and a black, grey, or mustard sweep is exactly as seamless as a white one. The pure-white catalogue look is just the most common application: light the backdrop brighter than the product until it clips to paper white.
Reach for it when you need a hundred products to look like they came from the same set: catalogue grids, marketplace listings, spec pages. The contact shadow under the product stays, and that is the point. It keeps the object sitting on something real instead of hovering.
Gotcha: 'seamless' means no corner. It does not mean no shadow, it does not mean white, and it is not the same thing as a cutout. The other trap is exposure, if you are going for white. Light the backdrop about one to two stops above the product or the paper photographs grey, but push it much further and the spill eats the edges of any white or chrome product.
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Studio product photograph on a seamless white sweep: continuous curved paper backdrop with no visible horizon or wall-to-floor corner, background lit to pure white, product centered with generous margin. Large soft key light from the front-left, white fill card on the right, and a soft contact shadow directly under the product so it sits on the surface. Even exposure, no color cast, sharp front to back, e-commerce catalogue look.