Relationships refer to mappings between elements of one set to another set, such as one-to-one, one-to-many, many-to-many.

A battery is a portable electrical power source which is often used in mobile devices.

Expressive, robust, feature-rich CSS language built for Node.js

A color picker is a widget used to preview and test color values.

Micro-optimization is the process of meticulous tuning of small sections of code in order to address a perceived deficiency in some aspect of its operation (excessive memory usage, poor performance, etc).

Refers to reducers in the mapreduce framework. Mappers split up a large problem and solve parts of it in parallel. Reducers collect and summarize the output of a map method.

Wi-Fi Direct is an extension to Wi-Fi, created by the Wi-Fi Alliance, that allows for Bluetooth style point-to-point networking as well as the more well known method of networking with access points that Wi-Fi traditionally uses. It is designed to make the process of connecting small intelligent devices like phones and cameras and even home appliances easier and faster. To make it easier to exchange information and files between devices as needed.

Android 4.2 Jelly Bean (API Level 17) is the version of Android Operating System preceded by Android 4.1.

A developer tool is an application used to write, edit, or debug another application, or web site. There are varying kinds of developer tools, from fully blown IDEs, to single purpose tools.