The Kalman filter is a mathematical method. Its purpose is to reduce noise and randomness in collected data, making the recorded data closer to the actual.

restify is a module for use with node.js that facilitates the creation of REST web services.

Forever is a Node.js package that ensures a script continues to run. Do not use this tag for everlasting conditions, loops, animations, …

DDMS is an Android SDK tool that provides port-forwarding services, screen capture on the device, thread and heap information on the device, logcat, process, and radio state information, incoming call and SMS spoofing, location data spoofing, and more.

GENERAL HARDWARE SUPPORT IS OFF-TOPIC. Questions about hardware should be asked on https://superuser.com. A hard drive is a physical storage device used to save state for operating systems and individual software programs. Questions should relate to reading and writing via programming.

Linkage describes how names can or can not refer to the same entity throughout the entire program or a single unit. Linkage is particularly useful in C++.

A web application framework is a software framework that is designed to support the development of dynamic websites, web applications and web services. The framework aims to alleviate the overhead associated with common activities performed in Web development.

The internals tag denotes questions about how things work, as opposed to how to accomplish something specific. Of course, how something works underneath will have practical implications, but internals questions aren't about how to do something; rather, how to understand something.

Anything related to encoding or decoding HTML entities.

Notation refers to a specific way of writing various concepts, functions, etc. Usually it is introduced to abbreviate complicated expressions and make common idioms more readable.

amcharts is a JavaScript chart library. Use this tag in addition to the amcharts tag, for questions related to amcharts v4.