Strawberry vodka is a flavored vodka with the aroma and flavor of [ingredient=strawberry strawberries]. It can be as simple as infusing strawberries into vodka, in which case the resulting liquid will be red, or as complex as distilling that infusion so that it is clear, then further flavoring the spirit and sweetening it lightly.
Most commercial strawberry vodkas are around 70 proof. Stolichnaya and Smirnoff are two common brands of strawberry vodka.