Asteraceae or Compositae, also known as Aster. Well, it has more than 23,000 currently accepted species, spread across 1620 genera and 12 subfamilies. A large group indeed, so I have no idea which one is it, but they share similar characteristic.
It's leaves are edible, hence are often used in salads. The flower itself can be used to make herbal tea and honey.
This april birth flower's name ‘daisy’ came from Anglo Saxon words ‘daes eage’ meaning ‘day’s eye’. Well, it looks indeed like sun, isn't? Hence, it's another name is Sunflower. Oh, and also, in flower languages, it means implicity, modesty, innocence, stability, sympathy and cheerfulness.