How do i keep an app open whilst also browsing on chrome? Dumb question but...

So i'm using the app but want to research something related on the web , and switch back and forth between the two.

Thanks
Hold down the button that brings up all your applications. It's usually the one on the right hand side. Then once you see the app you're using on half of the screen you can either select the browser from the running apps selection that is listed on the other half of the screen if it is running, or press the home button in the center and select your browser that way. If done correctly you should bring up your browser and whatever app using simultaneously.