Android is an operating system.

Customer to Customer marketing has become more popular recently with the advent of the internet. Companies such as Craigslist, eBay, and other classified and auction based sites have allowed for greater interaction between consumers, facilitating the Customer to Custome model.

A debugger or debugging tool is a computer program that is used to test and debug other programs.

An object file or OBJ file is a file containing object code, meaning relocatable format machine code that is usually not directly executable. Object files are produced by an assembler, compiler, or other language translator, and used as input to the linker, which in turn typically generates an executable or library by combining parts of object files.

Java applications are typically compiled to bytecode (class file) that can run on any Java virtual machine (JVM) regardless of computer architecture.

A killer application is any computer program that is so necessary or desirable that it proves the core value of some larger technology, such as computer hardware, gaming console, software, a programming language, software platform, or an operating system.

A firewall is a software or hardware-based network security system that controls the incoming and outgoing network traffic by analyzing the data packets and determining whether they should be allowed through or not, based on a rule set. A firewall establishes a barrier between a trusted, secure internal network and another network (e.g., the Internet) that is not assumed to be secure and trusted.

A hexadecimal number has base 16.

Except the number 445, all other numbers are perfect squares. Hence, it is the odd one in the series.

Tsunamis can be caused by undersea earthquakes as the one caused by the 2004 Indian Ocean Earthquake.

Red soil indicates the presence of iron oxides.

The Aravalli range are the oldest fold mountains in India. The northern end of the range continues as isolated hills and rocky ridges into Haryana state, ending in Delhi.

He was the first Viceroy of India. He abolished the Doctrine of Lapse and also established three major universities at Calcutta, Bombay and Madras.

Marshes, swamps, and bogs are all considered wetlands. Plant species adapted to the very moist and humid conditions are called hydrophytes. These include pond lilies, cattails, sedges, tamarack, and black spruce.

The presence of water on the surface of Earth gives it the blue colour. 71% of the surface of Earth is covered with water and only 29% is land.

Characterisitcs of Tundra are- extremely cold climate, low biotic diversity, simple vegetation structure, limitation of drainage, short season of growth and reproduction, energy and nutrients in the form of dead organic material and large population oscillations.