Computer

Before electronic computers became commercially available, the term "computer", in use from the mid 17th century, literally meant "one who computes": a person performing mathematical calculations. Teams of people were frequently used to undertake long and often tedious calculations; the work was divided so that this could be done in parallel.
A computer is a machine that manipulates data according to a set of instructions.
A programmable device that performs mathematical calculations and logical operations, especially one that can process, store and retrieve large amounts of data very quickly.

Desktop Computer - A computer that usually consists of a central processing unit (CPU), a monitor, and a keyboard as separate units, connected by cables.

All-in-One Computer - A computer with the central processing unit (CPU) and monitor built into the same device. Examples include the Apple iMac and the HP Touchsmart.

Laptop/Notebook Computer - A lightweight, portable personal computer that can fold closed when not in use that typically weighs less than 6 lbs. and is able to fit inside a briefcase.

Netbook/Mini-notebook Computer - A smaller version of a laptop/notebook computer with a smaller screen and keyboard. Screen size is typically 10.2 inches (25.9 cm) or less. Typically they also have lower performance processors (i.e. ATOM) than laptop/notebook computers (i.e. Centrino, Core) do. Examples include Asus eeePC, Acer Inspire One, Dell Mini9, and HP Mini.

Home telephone - A telephone that is not mobile and which may only be used within your home.

Basic mobile phone - A cellular/mobile phone with voice, texting, and basic data features like ringtones and simple web browsing.

Smart phone - A higher end phone with sophisticated features which can include touchscreens, full mobile web-browsing, and an underlying high-level operating system. Examples of smart phones include BlackBerrys, the Apple iPhone, HTC devices running on Android, devices with Microsoft Windows, Nokia devices with Symbian like its N and E Series (N97, E71), and devices by Palm.