In this video the interaction of femtosecond laser pulses with metallic nanostructures is demonstrated.These light pulses can excite collective electron oscillations within the nanostructure, so called plasmons. By precisely tailoring the nanostructures, light can, e.g., be coupled into plasmonic waveguides and then squeezed into nanometer-sized volumes, much smaller than the diffraction limit of propagating light. Herewith both the spectroscopic investigation and the ultrafast manipulation of single, nanometer-sized objects are possible. This manipulation is demonstrated in the second part, in which ultrashort light pulses are used to control the propagation of a second light pulse. This plasmonic switch can in principle be orders of magnitude faster than electronic switches.