Is it a cure for aids?

No. No cure, but treatment can suppress the infection and let you live a normal life, or close to it. The earlier you are diagnosed and sooner you start treatment, the better.
Not yet. No cure for aids exists so far. With proper treatments, however, aids can be well controlled and you can live with for many years (though on average, much less than a normal life span). One should avoid unprotected sex especially between men and IV drug use, as those are two biggest avoidable risk factors.