Paganism is all encompassing of the Pagan religion. There are several different "paths" within Paganism including Wicca (Witchcraft work), Shamanism, Druidism, etc. Each path has its own design of rituals, deities and craftwork.
As a Druid myself, I have worked in several eclectic circles that have included Egyptian magic, Shamanism, Wicca and Dianic paths.
In essence, I believe that all Paganism paths are focused on the old religion (meaning earth based religion). However, the most significant difference is in the design of rituals and the deities that are called upon in the rituals.
Again, generically, Paganism is vast and diverse could be simplified by being referenced to the label likeness of Christians practicing Christianity. However, where there is a label reference to Wicca, Druid, Dianic or Shaman so do the Christians have Baptist, Methodist, Unitarian, etc. The largest common denominator in Paganism is that followers are generally polytheistic in their beliefs. Wicca’s tend to circle with small groups of members where as in Paganism there is no set or defined amount of individuals to create a group and they generally operate as a collective whole of the religion.