<human>:  Is there a difference between a Saturn V rocket and a Saturn IV rocket?
<bot>: Yes, there is a difference between a Saturn V rocket and a Saturn IV rocket. The Saturn V rocket was a three-stage expendable launch vehicle used for the Apollo program, while the Saturn IV was a two-stage heavy-lift launch vehicle used for the Apollo and Skylab programs. The Saturn V was significantly larger, more powerful, and had a higher payload capacity than the Saturn IV.