Braided Updo
This style involves taking the braided hair typically a french braid or a dutch braid, than you coil the braid into a bun at the nape of the neck (or on the top of the head).
Dutch Braid
The Dutch braid is one of the more common braids, its a three strand braid but instead of the hair being crossed over eachother they are crossed under eachother.
This is an example of a single dutch braid, its the exact same as the dutch braid were you go under instead of over.
This is a french braid, also using a three strand technique creating a flat surface with the braid still showing.
Another picture of a dutch braid.