What kind of shrub or plant grows fast to make a fence / wall to keep

You don't want anything that has big roots. I tree could cause more damage. I started to grow ivy to cover a support pole I put in to save the wall in the back. Day Lillys are tall and easy to grow if you want to cover up the bottom of the fence. Also I saw bushes along fences would look nice.

Forsythia makes a nice border

ok...location,amount of space to plant,prefernce of shrubs...how is one to answer without information????????

Dwarf Boxwoods make a great border and they stay a great small size.If you want a faster growing taller type bush go with Arborvities.There are different kinds and they make an excellent privacy wall.