What is dough starter?

Answer 1

For yeast-based doughs such as bread dough, a starter usually consists of yeast, sugar, water, and a small amount of the flour you'll be using in the finished baked good. This is sometimes referred to as a sponge. Sourdough bread is usually created using a starter like this. Some people keep their sourdough starter going for months or even years, since yeast are a living plant. They store the starter in the refrigerator, and replenish it with additional components as needed.