Many technological applications as well as biological scenarios rely on the dynamics of confined systems.
For example, membranes for water desalination and devices for polymer separation rely on porous materials that work as filters. Similarly, micro--patterned membranes are exploited for hemofiltration in artificial kidneys~\cite{Fissell2009} and oil extraction has been promoted by microfluidic devices.
Moreover, the development of soft robotics and soft sensors/actuators involved in the Internet of Things (IoT) is based on hydrogels whose complex dynamics involves electrolytes moving across a polymer matrix.
Finally, in the biological realm, cellular processes are controlled by membrane nano--pores and channels that regulate the flow of ions and molecules. At larger length scales, lymph is formed and transported across microvessels~\cite{Swartz2012} and the control of lung interstitial fluid is crucial for lung edema.
The performance of all the aforementioned systems is controlled by both the dynamics of the confined system, i.e. electrolytes, polymers and molecules and the coupling with the confining medium, as electrodes, channels and pores. In this contrbution I will review some aspects of the transport of confined systems, in particular focusing on those regimes in which the geomtry of the confining pore strongly affects the transport i.e., when confinement is a control parameter.