why does my internet browser opens up with an add every time with lockscreen on s8

[Android Central Question]

i did all the things like clearing data cache nd all bt still....
it always done with default browser if i change it then same problems starts again with new browser !!!

 

[B. Diddy]

Welcome to Android Central! Does the ad show up when you're using the browser, or in the lockscreen? That's two different places.

If the ad shows up in your browser, it's likely related to the site you're visiting -- avoid that site. If it shows up on the lockscreen, then some app you installed came with adware. Uninstall apps one by one until it goes away.