The observational properties of fast, tenuous stellar winds from the hot component in symbiotic systems are summarized. Very interesting are the strong variations of wind parameters, which seem to be connected with the fast evolution of the hot component after nova-like events. In a few symbiotic systems collimated outflows from the hot component are found, which are highly variable on short time scales.

Also the cool giant companion has a stellar wind, which is slow, dense and partly ionized by the hot star. Evidence for wind collision regions comes from various sources, such as X-ray observations and spectroscopy of high excitation emission lines. It is also expected that the wind collision has a most important impact on the hydrodynamical structure of symbiotic systems. A summary is given of the observational data on the circumstellar structure from the innermost regions out to the extended nebulosities. This includes photometry, spectroscopy, spectropolarimetry and imaging work.