Recently, with the advent of the latest generation of Cherenkov telescopes, as MAGIC, HESS and VERITAS, a new kind of binary systems was revealed, the so called "gamma-ray binaries". Since the discovery of the first component of this new family, back in 2005, only four other systems have been detected. In this talk, I will first briefly make an introduction to gamma-ray astronomy and binary systems, and later explain the main characteristic of the gamma-ray binaries. Finally, I will show what the main topics of my PhD research are.