The Rite of Christian Initiation of Adults (RCIA) is the process whereby adults enter the Catholic Church. RCIA classes are held weekly and over the course of several months those who attend the RCIA classes are educated on what the Catholic Church believes and are given the oppurtunity to ask question about those beliefs.
Just because you start RCIA, doesn't mean you are committed to finished. If you are merely curious about what Catholicism is, please feel free to come. All are welcome.