Your contacts are stored in a few different places on your Android device, including the Contacts app and your Google Account. The Contacts app is where you can view, edit, and manage your contacts, while your Google Account is where they're synced and backed up. This way, you can access your contacts from any device with an internet connection.
The Contacts app is usually found on your home screen or in the app drawer, and it's where you can add, remove, and edit contacts. You can also assign contacts to specific groups, like Friends or Family, to make it easier to find the people you need to reach. Plus, you can add additional details like addresses, birthdays, and notes to each contact.