According to Islamic-Dictionary >> Fitna / Fitnah means :
To set up rivalry among the Muslims. To disclose secrets about the actions of another person (slang: snitching or grassing).
According to Quran and Sunnah >> Fitna / Fitnah interpretes as follows :
Confusing truth with falsehood, Testing and trial, Blocking the way and turning people away, …
to find out more about the word Fitna / Fitnah check out this link :
This video is to answer “FITNA” to Islam :