In simple, non-mathematical language, B-Splines will create a smooth curve through automatic smoothing between two consecutive control points without having to adjust any handles like one would have to do with Beziers.
simple curve is a curve which doesnot cross itself,it neednot be closed....... but a simple closed curve is a curve which is simple and also closed. every simple closed curve is a simple curve but...
Honestly not a huge on bold has a bigger keyboard so if u have fat fingers its a bttr choice haha jk but the biggest differnce is the bold has flash photography while the curve has a sucky camera...