ShwetaSingh Thanks for the suggestion. as i mentioned earlier, we are collecting the values those who are using our website & mobile app in an eVar.
For website/mobile browser/tablet users
s.eVarX="website";
For Mobile App users
s.eVarX="Mobile app";
Can we use this eVar to create a segment something like below. My primary question is to identify the users those who are not using our Mobile app so that we can identify based on the below segment to target them to promote our mobile app via Target. Does it make sense?
c_eVarX == website
AND NOT
x_eVarX == Mobile app