Difference between Weighting & Algorithm param?

Open Source Routing Engine
1

I am trying to find out the difference between weighting and algorithm parameters for web api.

2

The weighting can be e.g. fastest or shortest and controls the ‘route quality’. The algorithm can be dijkstra, dijkstrabi, astar, … and controls a bit the speed where astarbi should be the fastest for none-CH and dijkstrabi for CH.

BTW: Moved this from Directions API to Core