A strawberry is a little red fruit, well, berry actually, and it's not always red either, it can be white, green, or pink, but usually is red. It's kind of seedy with hundreds of tiny little seeds and very sweet, except for the sour varieties and the ones that aren't quite ripe yet.

It grows on a small vine like plant close to the ground, and usually has white or pink, or sometimes red flowers. A strawberry is a very yummy treat, especially when freshly picked, except if you are allergic, then you shouldn't eat it.

I'm not entirely certain what else you want to know, but Wiki has a good article that gives an overview of what it is to be a strawberry: http://en.wikipedia.org/wiki/Strawberry