What is the difference between a 3-tab and an architectural shingle?

3-tab shingles have cutouts called “keyways” that make the roof appear to be made up of several uniform pieces of material. Architectural shingles are made by laminating two pieces of material together to create more texture and depth. Since there are no cutouts, they have a more random appearance than 3-tab shingles.

More.

A 3-Tab shingle literally has three one-foot wide tabs and is flat in appearance. Architectural shingles are laminated, which adds a unique appearance resembling the textured look of shake shingles.

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