Superstring theory incorporates supersymmetry, which also allows it to describe fermions.

Supersymmetry, of course, is the idea that there exists a corresponding boson for every fermion and a corresponding fermion for every boson.

A nice consequence of incorporating supersymmetry is that superstring theory only needs 10 dimensions to be consistent (or without logical contradictions), while bosonic string theory requires 26.

The most recent version of the Superstring theory incorporates 11 dimensions.

I don't think there is such a thing as the "supersonic theory". If you mean "superstring theory", no, they are not the same.

The Superstring Theory is an attempt to explain all of the particles and fundemental forces in one theory, by modeling them as vibration of tiny supersmyetric strings. It is commonly considered one of the most promising candidate theories of quantum gravity. It deals greatly with with Einstein's Theory of Relativity, Quantum Mechanics, Quantum Field Theory, and extremely small and extremely large calculations. E.g. The Planck force 1044 . And the Planck Length 1035 . The String Theory also explains the addition of dimensions, instead of the regular 3 dimension. There is more information at http://en.wikipedia.org/wiki/Superstring.

Sort of. Superstring theory is solvable only in 11 dimensions. Whether or not these dimension exist and what they mean is still to be determined. Google "string theory".

It's the tension of the strings in Superstring Theory. The tension refers to the ability of a string to vibrate at high or low frequencies, which is responsible for the energies of particles.