If you are developing an Android application and need to lauch Google PlayStore's home page from your app. Then use this command to do that: market://details?gotohome=1. It's an android market linking prefix that allows you to open Playstore app independently. Means it won't embed within the app, rather it will open Market app separately. All you have to do is just create a button layout and trigger the command with that.
This code also can be use to check whether the Play store app is installed or not. Another use off this code is that, you can open a specific application's developer page in PlayStore. To do that, use the market:// prefix and target a specific app by its package name or app id. Here's the example:
market://details?id=packageName or appId
Market details gotohome 1 is also frequently searched on Google because some developers make mistake while using this code. Example if they use http:// in front of the code, then it will open a browser like Google Chrome, which will search for the code automatically instead of launching PlayStore. I think you also came where because of that issue.