Technically, the strawberry is an aggregate accessory fruit, meaning that the fleshy part is derived not from the plant’s ovaries but from the thickened part of the stem that holds the ovaries. Each apparent “seed” on the outside of the fruit is actually one of the ovaries of the flower, with a seed inside it.
Why are they called strawberry when they are not made of straw? One theory is it comes from “stray” or “strew,” designating the spread of the plant’s runners in an unchecked field of strawberries the plants. They appear to have been strewn across the ground with their runners straying everywhere, hence strew, strewn, straw.