The package name in an Android application is a unique identifier that identifies on the device and on the Google Play Store. For apps published on the Google Play Store, the package name is included in the app's URL.

For example, the URL ‘https://play.google.com/store/apps/details?id=com.example.myapp’ shows the package name ‘com.example.myapp’.

Choosing a proper domain name is crucial for establishing a strong online presence. Here are some tips to help you set an effective domain name:

● Select a domain name that matches or reflects the name of your application.

● Ensure it is not too similar to existing trademarks or other businesses to avoid legal issues.

● Aim for brevity; shorter names are easier to remember and type.

● Ideally, keep the name under 15 characters if possible. This helps prevent typos and makes it easier for users to recall.

● Stick to lowercase letters, numbers, and periods.

● Avoid using numbers (e.g., "5" vs. "five") and hyphens, as they can confuse users when spoken aloud.

Incorporate relevant keywords that describe your business or services if possible. This can help with search engine optimization (SEO) but avoid overloading the name with keywords.

Avoid using sensitive contents such as pornographic, violence, hateful or abusive content in the domain.

You can provide any of the following documents to prove that you are the owner/publisher of the application.

● Trademark registration documents for the application name or brand.

● Proof of company registration information.

● Legal authorization documents (such as for agency, distribution, cooperation, etc.).

● Screenshots of the official profile page of the application on social media platforms (Facebook and Twitter should clearly show the Edit button; for YouTube, a screenshot from YouTube Studio is required).

● Screenshots of release records for versions on other platforms.