they are not used for anything, they are just there because they were formed from moons crashing and space rocks that were tiny enogh to fall into its orbit.
Yes Uranus has rings
they came from a cloud of gas and dust that got pulled in its atmosphere.
1986U2R, 6, 5, 4, Alpha, Beta, Eta, Gamma, Delta, 1986U1R, Epsilon
Elipson is the brightest ring of uranus...