1. iOS：
iOS是苹果公司提供的移动操作系统。它主要是为iPhone和iPod Touch等Apple移动设备设计的。它以前被称为iPhone OS。它是基于Darwin(BSD)操作系统的类Unix操作系统。它是仅次于Android的世界第二使用最多的移动操作系统。它主要用C，C++，Objective-C，汇编语言和Swift编写。 iOS的第一个版本于2007年发布。
2. Android ：
Android是Google LLC提供的移动操作系统。它基于Linux内核和其他开放源代码软件的修改版。它是专为智能手机和平板电脑等触摸屏移动设备设计的。它是使用C， Java，C++和其他语言开发的。 Google于2008年推出了第一个Android版本。最新的稳定版Android是Android10。它完全免费提供。总体来说，它是最常用的操作系统。
iOS和Android之间的区别：
| S.No. | IOS | ANDROID |
|---|---|---|
| 1. | It was developed and is owned by Apple Incorporation. | It was developed by Google and Open Handsert Alliance and is owned by Google LLC. |
| 2. | IOS was initially released July 29, 2007 | Google was initially released in 23 September , 2008. |
| 3. | when IOS released it’s first version is iPhone OS 1, before named IOS . | When Google released it’s first version is Android 1.0, Alpha. |
| 4. | It was launched in 2007. | It was launched in 2008. |
| 5. | Its target system types are smartphone, music player and tablet computer. | Its target system types are smartphones and tablets. |
| 6. | It is specially designed for Apple iphones and ipads. | It is designed for smartphones of all companies. |
| 7. | Its kernel type is Hybrid. | Its kernel type is Linux-based. |
| 8. | It has the preferred license is Proprietary, APSL and GNU GPL. | It has the preferred license of Apache 2.0 and GNU GPLv2. |
| 9. | It is mainly written in C, C++, Objective-C, assembly language and Swift. | It is written using C, C++, Java and other languages. |
| 10. | Its update management is Software Update. | Its update management is Systems Software Update. |
| 11. | Swift is majorly used for iOS application development. | Java and Kotlin are majorly used for Android application development. |
| 12. | IOS has Commercial Based Source model with open source components. | Android is an Open Source based Source model. |
| 13. | IOS based Devices have Safari as default Internet Browser. | Android devices have google chrome but one can install any Internet Browser. |
| 14. | IOS have Siri as Voice Assistant. | Google have Google Assistance. |
| 15. | IOS based Devices have a feature of blocking 3rd party app stores. | But Google doesn’t block 3rd party app stores. |
| 16. | IOS devices available with 34 languages. | Android Devices available with 100+ languages. |