Waydroid is a tool that allows users to run Android applications on a Linux desktop by creating a virtual environment. To install Waydroid, users need a functioning Linux system (specifically Ubuntu Desktop 24.04), a valid Google account, and sudo access. The installation process involves installing necessary dependencies, adding the Waydroid repository, and installing the Waydroid application. After installation, users must select GAPPS from the Android Type drop-down menu to access Google Play Services. To use the Google Play Store, users need to retrieve their Android ID by executing a command in the terminal and then register their device on the Google Uncertified Page using the retrieved ID. After registration, users can explore and run Android apps.