There has been much excitement about the first gravitational wave detection and the first multi-messenger signal. LIGO/Virgo have issued the first gravitational wave catalogue that comprises 11 signals, all from the merger of compact objects. We expect however to see a broader variety of signal morphologies than the ones observed so far, reflecting a broader range of astrophysical phenomena. In this talk I will concentrate on continuous gravitational waves. I will outline the main features of the detection problem — which is probably the most complex across the gravitational wave spectrum — , results to date and future prospects.