new giant electron-positron collider, operating at energy frontier is a natural continuation and extension of the successful research at the LHC. The four projects of such accelerators: two linear (ILC and CLIC) and two circular (FCC-ee and CEPC) are currently in various stages of development. In the next few years important decisions are to be made about the realization of such collider(s). In particular, the issue of a future electron- positron collider plays a pivotal role in the discussions about the update of European strategy for particle physics. The most important features of the proposed accelerators will be presented. The article will also discuss the physics program for new e+e- colliders.