In fact, light is not the only "thing" that travels with the speed of light; any particle with zero mass travels with the same speed of light. These particles include, for example, graviton and gluon. Using Einstein's special relativity, one can show that for an object with finite (nonzero) mass, it would cost infinite energy to accelerate it to the speed of light. Hence for any objects in our daily life, it is impossible to accelerate it to the speed of light, because everything in our daily life has finite mass. Hence the "speed of light" is the fastest speed in the universe guaranteed by the infinite energy barrier.

A wonderful answer for this question is here. Enjoy it!

What is the reason we hear with our ears? Not everything has a reason.
Light speed.

Light has no mass, which means that even the smallest amount of force would make it go the fastest speed that anything can possibly go, which is the speed of light.