Memcapacitor is a new type of circiut element which can be useful in a wide range of applications including memory, tunable analog circuits, and analog neural networks. It can be realized as a micro- or nanoscale solid-state device, possibly implemented within (or post-processed on top of) a CMOS chip. The approach based on combination of a memristor and a typical MIM capacitor is promising as it can benefit from the fabrication techniques being developed and used for memristors. These techniques are rapidly maturing, enabling large capacity resistive memory (ReRAM) chips. However, the memristor-based memcapacitors will require more complex techniques for their programming than memristors, because their impedance is frequency dependent and the parasitics induced by direct access to the middle electrode may potentially disable some applications.