DropDown-Pattern Matching/Auto Pop

I need a drop down menu where i can type in letters and it narrows the choices down for me. For ex. I have a list of names....Andy, Adam, Angie, and Arnold. If I type A-N, it should eliminate Adam and Arnold from the list. I don't know the technical term, but its like an auto-populate. So in the drop down box after typing A-N it should say Andy. Then when i type G, it would then say Angie. The bold just indicates that it auto fills the box for me. Can anyone help. Thank you