Probing the interfacial friction in narrow confinements is becoming increasingly important in various applications encompassing fluid dynamics over micrometer and nanometer length scales, including applications pertinent to molecular biology, biochemistry, and energy conversion. The present article aims to present a broad overview on the progresses made towards understanding the fundamental mechanisms dictating such interfacial phenomenon, from empirical, semi-empirical to more rigorous physical and mathematical considerations. Futuristic outlook on the related research activities are also outlined, both from fundamental considerations as well as from application viewpoints.

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