How does solar wind differ from electromagnetic radiation from the Sun?
It differs due to the fact that:
Electromagnetic Radiation from the Sun that travels through the solar system is an array of different wavelengths being mainly in the Visible, UV and Infrared portion of the Electromagnetic Spectrum.
Whereas Solar Wind is the continuous flow of charged particles (plasma) emanating from the sun, which is comprised mainly of protons and electrons at high temperatures, about 1 million degrees Celsius, and travels at speeds of just under 1000 km/s, which also travels through the entire solar system.
Solar Wind interacting with the Earth's Magnetic Field causes an awesome phenomena called the Aurora Borelais which can be seen in the uppermost Northern Hemisphere and other rare locations. Example of an Aurora:
Hope I helped :)