What is the difference between wicca and witchcraft?

Witchcraft is a kind of broad term and is often confused with Wicca. Wicca is a religion that holds natural elements water earth etc in high esteems. Wiccans believe nature has special powers that can be manipulated to be helpful. Witchcraft generally leans toward asking gods ghost and spirits to help as opposed to elements found in nature and can refer to dark and light practices. Both subjects are very broad so do research on your own if you have more questions. :D