Raisins come in seedless and seeded forms. Popular types are Sultana, Muscat, Thompson, Black Corinth and Golden. Despite being frequently mistaken as such, Currants are not raisins, but are similar.
There are the regular sun dried grape raisins. There are white raisins made from green grapes. And, then there are craisins made of sun dried cranberries.
Raisins are nothing more than dried grapes. There are as many different types of raisins as there are different grapes. The main type of raisins are made from the Thompson grape. They include the dark raisins as well as the golden raisins. The golden raisins are yellow since they are processed differently. Currants are raisins made from small grapes.