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Snippet from Wikipedia: Ultrabook

Ultrabook is a class of premium consumer-grade notebook computers; the term was originated by and is a trademarked brand name of Intel. Introduced in 2011, they were originally marketed as featuring ultra thin form factor and light weight design without compromising battery life or performance, running on Intel Core processors.

When newly introduced, Ultrabooks were generally small enough compared to average laptop models to qualify as subnotebooks. As ultrabook features became more mainstream in the mid-late 2010s, explicitly branding laptop models as "ultrabooks" became much less frequent. As of 2021, while Intel maintains the Ultrabook trademark, it is rarely used for new models and has been superseded in Intel's own marketing by the Intel Evo branding.

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