What does it mean that the mobile phone comes with software? Say it briefly

First of all, the mobile phone's own software refers to the software built into the mobile phone by the mobile phone manufacturer, including some system tools and a small amount of application software! As for which one cannot be deleted, it must be that the system software cannot be deleted. Generally, it cannot be deleted. He will prompt that the system software cannot be deleted. This is because the system software has added special protection! There are also some commonly used applications, such as weather forecast, games and calculators, which can be deleted! You can download it back after deleting it! There are many online! What system is your mobile phone? If it's Android, search a lot of weather forecasting software online!