The result of adding two or more quantities together.

A software development kit (SDK) is a set of development tools that allows for the creation of software for a certain hardware platform, development environment, or software package. A SDK may consist of a combination of APIs, an IDE or other development tools, and frameworks.

Exception handling is a programming language construct or computer hardware mechanism designed to handle the occurrence of exceptions, special conditions that change the normal flow of program execution.

Floating point numbers are approximations of real numbers that can represent larger ranges than integers but use the same amount of memory, at the cost of lower precision. If your question is about small arithmetic errors (e.g. why does 0.2 + 0.1 equal 0.300000001?) or decimal conversion errors, please read the "info" page linked below before posting.

Selectors are patterns that match against elements in a document tree. In a CSS rule, they are used to define styles for elements that match the pattern.

In the real world, a camera is a device that takes physical or digital photos. In the virtual world, it is used to aim at virtual objects and or move through a virtual scene.

The UICollectionView class manages an ordered collection of data items and presents them using customizable layouts. Collection views provide the same general function as table views except that a collection view is able to support more than just single-column layouts. Collection views support customizable layouts that can be used to implement multi-column grids, tiled layouts, circular layouts, and many more. Available in iOS 6.0 and later

An event which occurs when user clicked an object. It is a combination of two events, that is, "onmousedown" and "onmouseup".

Binary, the base-2 numeral system, represents numbers using two symbols: 0 and 1. For compiled computer programs, use the "executable" tag instead.

CRYPTOGRAPHY MUST BE PROGRAMMING RELATED. Cryptography covers, among other things, symmetric and asymmetric encryption, hashing, and digital signatures. Cryptography questions not directly related to software development are better asked at crypto.stackexchange.com.

Routing is the process of selecting paths in a network along which to send network traffic. For the process of associating URLs to content, use the tag url-routing instead.