Begonia

This is a Begonia, of which there are many kinds. Needs filtered or bright indirect light and regular water. This makes an excellent houseplant or an annual for the shady outdoor garden. Be careful not to over water it! Moist, not wet soil.
It is a genus of about 1300 species and numerous cultivars. They are divided into 7 informal groups because they vary so much on their growth habit and cultivation needs.
They are very sensitive to rotting. When repotting make sure to not plant in a pot that is much bigger than its original pot and make sure to keep the soil level the same depth. If the soil touches the stem it will rot and perish. Its best to allow them to briefly dry between waterings. They are not poisonous.