Testing on real device allows you to run your mobile applications and checks its functionality. Real device Testing assures you that your application will work smoothly in customer handsets.
Emulator is a software program that allows your mobile to imitate the features of another computer or mobile software you want them to imitate by installing them to your computer or Mobile.
The wide gamut of mobile devices creates the problems, whereby the testers are not confident about which mobile devices to invest in for testing, considering the budget constraints. Emulator/simulator (s) is tailor made for this type of situation(s).
It is easier to do web application testing on emulators when it comes to opening the web application. The user just needs to copy and paste the application URL.
If testing is your objective then you should check out LambdaTest emulators where Latest versions of Android and iOS are available. You can even take screenshots of the emulators and responsive testing as well.
You can find more details of LambdaTest here:-Perform all your tests on cloud