Plasma heating at the electron cyclotron resonance and its harmonics has provided a range of important results in tokamaks, stellarators and mirror machines although only tokamaks are considered here. The ability to heat the electrons locally has enabled Te profile control, m=1 and m=2 mode stabilisation and heat transport to be studied. At high powers the energy confinement degrades in an L‐mode like manner in some cases. At very low and at high densities however confinement improves with heating. Current drive has been observed in the WT‐2, WT‐3 and CLEO tokamaks. In this paper the present state of ECRH, the advances since the last review and the current drive results from CLEO are reported.