Yes. You are perfectly correct. Light is the electromagnetic radiation that has the range of frequency 4*10^12 to 750 *10^12 per second.This is a very small part of the spectrum of electromagnetic radiation whose range is extremely large .
Only the radiation of the range said above makes sensation of light in the human beings. However a diffrent upper and lower range of spectrum can make the visible sense in animals which is a nature's gift for them.
Light is obeys both particle and wave theory. The energy through the light caused by photons are absobed by objects but then the photon has no rest mass and the radiation energy recieved by anything is absorbed, reradiated , reflected or refracted in the environment.
The light, particularly the sunlight, is a mixture of electro magnetic radiations of diffrent frequencies, which travel in a straight line in a media and are subject to the laws of reflection, and refraction when it changes media of propogation.
The speed of the light is around 3*10^8 meter per second in vacuum.
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