Almost all types of grapes (And there are well over 3000 varieties of grapes in the world) contain some form of sugar. The sugar in grapes is not like the sugar we find in sodas or pops.

Sugar in grapes is 100% natural.

However, the amount of sugar found in grapes is not enough to make wine.  To make one liter of wine without sugar means you have to crush thousands of grapes like they did a long time ago in France.