The P-1 visa is intended for internationally recognized athletes.
The athlete must go to the USA, in order to participate in an individual or team event in the discipline for which he gained international fame. This event or series of events must already be known, or at least be budgeted, at the time of the visa application and can not be recovered after entering the United States. The spouse and children of the P-1 visa holder can accompany him by obtaining the P-4 visa by extension.
P-2 and P-3 Visas:
These categories of visas refer instead to artists or other entertainment figures who will act as part of an exchange program (P-2); or to artists who will act as part of a culturally unique program (P-3).