How do i code to move objects to follow a certain path ?

I get a random image from the net, im not going to use this, but just as example, i want the object to move along the path, following the curve, what is the best way to do it ?

Thanks

 

Runtime or in the editor also ok for me, and ... i thought 2D and 3D is perfectly the same in unity, for 2D, just the Y value is fixed.

Please suggest me a method or a keyword for me to study in that direction, i have nothing in my mind at the moment, thanks.

 

you can use empty objects to set the patch and lennard jones forces to do the curve effect
http://en.wikipedia.org/wiki/Lennard-Jones_potential
the end has a high attraction potential, and repulsive forces on the walls so the object wont collide

hope this helps

 

are u serious ? i have no idea what did i read =P

 

Splines would be a good choice such as in MegaShapes below.