A detail. Helps me to differentiate it from the tortilla (not the Mexican one). The level of cooking and ingredients are different. 

 i have read this fifteen times, could you elaborate on omelettes and torilla? 

 I think is better with an example:

https://www.bonappetit.com/test-kitchen/how-to/article/perfect-french-omelet-hint-will-butter

https://www.bonappetit.com/recipe/sour-cream-onion-tortilla-espanola 

 Interesting! Ty!!