Now that new heavy particles have not been found at the LHC, focusing on light and weakly interacting new particles is one direction to go. Fixed target experiments using accelerators play a part in this. I will explain the basics of the phenomena in fixed target experiments, and how to calculate the number of signal on a target induced by e+ e- beams. Trends in some fixed-target experiments will be introduced. I will discuss a few ideas for fixed target experiments at the ILC, and hope
that this talk will encourage people to think about the possibility of experiments other than the collider experiment at the ILC site.