What is the purpose of filler episodes?

Filler episodes are used by anime and other TV shows to extend the time between the individual plot points of the major story arcs, or between the end of one major story arc and the beginning of another.

Is it OK to skip fillers in anime?

in addition, Is it OK to skip filler in anime? Only filler episodes should be skipped. Although fillers are very bad most times but some are really good as well like G8 arc (196- 206) so u can watch it but still if u skip them there won’t be anything you will miss in main storyline.