Does light behave like particles or waves?

Light is and exists as a wave. It was once speculated to be a particle. But contrary to what many have been led to believe, it doesn't actually 'behave like a particle', beyond being of a non-continuous nature. Particles have mass, even though some have very little. Light exists in little wave bursts or packets (called 'quanta'). These packets are called 'photons'. They have various frequencies which are related to the energy they contain. But they are pure electromagnetic energy. They are part of a family called 'bosons'. All bosons are massless forces. The speed of light is NOT the same, but travels at different speeds depending on the media it happens to be traveling through at the time. Light only travels 186,000 miles/second in a vacuum. So, it actually accelerates and decelerates as it enters and exits different media. The amount of change is related to the light's wavelength, and the index of refraction of the media. That's how prisms work, and why there are rainbows. But photons are NOT matter. They are either emitted, reflected, refracted, changed, converted or absorbed... but never 'destroyed'. They are NOT affected by gravity because they have no mass. The 'bending' effect predicted by Einstein, and observed around massive objects, is due to light traveling in straight lines (as they always do) through space that has been warped by the gravity wells of massive objects like stars, black holes and galaxies.