Android is a mobile Operating System (OS) based on the Linux kernel and currently developed by Google. Android is designed primarily for touchscreen mobile devices such as smartphones and tablet computers, with specialized user interfaces for televisions (Android TV), cars (Android Auto), and wrist watches (Android Wear).

Features of Android OS

1. Messaging-: SMS and MMS are available forms of messaging, including threaded text messaging and Android Cloud To Device Messaging (C2DM) and now enhanced version of C2DM, Android Google Cloud Messaging (GCM) is also a part of Android Push Messaging services.
2. Web browser-: The web browser available in Android is based on the open-source Blink (previously Web Kit) layout engine, coupled with Chrome's V8 JavaScript engine.
3. Voice-based features
4. Multi-touch
5. Multitasking-: Multitasking of applications, with unique handling of memory allocation, is available.
6. Screen capture-: Android supports capturing a screenshot by pressing the power and volume-down buttons at the same time.
7. Connectivity-: connectivity with Android supports connectivity technologies including GSM/EDGE, Wi-Fi, Bluetooth, LTE, CDMA, EV-DO, UMTS, NFC, IDEN and WiMAX. Bluetooth connectivity, tethering connectivity.Etc.

Here I am telling you how to set ringtone in android device. Follow below steps

to set ringtone:

1.   Open Settings and choose Sound

2.     After select Sound now tap on Phone ringtone

.

Now, you have changed ringtone of your device.