The document discusses femtocells, which are small cellular base stations that provide indoor wireless coverage to mobile phones using a broadband internet connection. Femtocells allow service providers to extend cellular coverage inside homes and businesses. They provide benefits to both users and operators, including improved coverage, higher quality and data rates, lower costs, increased network capacity, and better performance. The document outlines what femtocells are, how they work, their benefits, advantages, applications, and concludes that femtocell technology represents an important improvement for future networks.