Why are iPhones so popular?

well, i saw many posts in this thread bout it, so am just gonna say what i know bout it ..
Apple is good at advertising their stuff which is a Marketing Experience, as for the models itself i guess it's pretty good phones "btw i'm android user not IOS" and what i believe in about iphones that they are so popular cuz it doesn't have the other issues that android got which is lagging ...etc