• Android is a software package and Linux based operating

system for mobile devices such as tablet computers and

smartphones.

• It is developed by Google and later the OHA (Open

Handset Alliance). Java language is mainly used to write

the android code even though other languages can be used.

• The goal of android project is to create a successful real-

world product that improves the mobile experience for end

users.

• Android 1.5 Cupcake was the second Android version developed by Google, a major platform release deployable to Android-powered handsets starting in May 2009. The release includes new features for users and developers, as well as changes in the Android framework API.

• Android 1.5 included new features such as an on-screen keyboard and Bluetooth support as well as improvements to existing features such as UI changes for application management and several Google apps.

Android 2.0–2.1 "Eclair" is a discontinued versionof the Android mobile operating systemdeveloped by Google. Unveiled on October 26,2009, Android 2.1 builds upon the significantchanges made by Android 1.6 "Donut".Two majoradditions in Eclair were support for near fieldcommunication (NFC) (used in mobile paymentsolutions) and session initiation protocol (SIP)(used in VoIP internet telephony).

LOLLIPOP

Android "Marshmallow" (codenamed M in-development) is the 6th major

version of the Android operating system. First unveiled in May 2015 at

Google I/O, it was officially released in October 2015.

Marshmallow primarily focuses on improving the overall user experience of

Lollipop, introducing a new permissions architecture, new APIs for

contextual assistants (a feature notably leveraged by "Now On Tap"—a

new capability of the Google searching by contextualizing an app into a

simpler interface by Google) Now, a new power management system that

reduces background activity when a device is not being physically handled,

native support for fingerprint recognition and USB Type-C connectors, the

ability to migrate data and applications to a microSD card and use it as

primary storage, and other internal changes

Android 7.0 "Nougat" is the seventh major version of the

Android operating system. First released as a beta build on

March 9, 2016,] it was officially released on August 22, 2016,

with Nexus devices being the first to receive the update.

Nougat introduces notable changes to the operating system and

its development platform, including the ability to display

multiple apps on-screen at once in a split-screen view, support

for inline replies to notifications, as well as an OpenJDK-based

Java environment and support for the Vulkan graphics

rendering API, and "seamless" system updates on supported

devices

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