A milkshake is made from milk and is a cold, sweet beverage that has different flavors added to it.
Vanilla is my favorite, Strawberry would be my second choice.
A lot of restaurants prepare their milkshakes "by hand". They use scoops of ice cream and milk mixed in a blender.
I like the hand scooped kind the best. Especially with cookies or candy mixed in with it.
Ice cream is a sweetened frozen food that is used to make milkshakes. I like flavored chocolate best myself.